How to Change the Navigation Bar and DPI on a Fire Tablet

The navigation bar is the row of buttons at the bottom of the screen, usually back, home, and recent apps. DPI, or dots per inch, controls how large items appear on screen. A lower DPI value makes text and icons smaller and fits more on screen. A higher DPI value makes text and icons larger and easier to read. Fire Toolbox can change both the navigation bar and the DPI on a Fire tablet. This guide explains what each change does, how to try it safely, and how to undo it if you dislike the result.

What the navigation bar change does

Fire Toolbox can change the navigation bar layout, for example by changing button order, adding buttons, or hiding the bar for a fuller screen. A fuller screen helps when reading or watching video, because the bar no longer takes space at the bottom. A changed button order helps if you come from another Android device and your fingers expect back and recent in swapped places. These are comfort changes, not speed changes. They do not make the tablet faster, but they can make it feel more natural to use.

Before you change the bar, note how it works now. Change the bar on its own first, without changing DPI at the same time. Two changes at once make it hard to tell which one caused a problem. If you hide the bar, learn the new way to go home before you hide it fully, and test it while Fire Toolbox is still open so you can undo it at once if you get stuck.

What the DPI change does

DPI changes the scale of the whole screen. Lower DPI fits more text on screen and shows more of a web page or a book at once. It also makes buttons smaller and harder to tap, which can be tiring on a small tablet. Higher DPI makes text larger and buttons easier to tap, which helps eyesight and helps children or older users. It also shows less on screen at once, so you scroll more.

Fire OS already offers a display size setting in Settings, under Display. Try that setting first if you only want slightly larger or smaller text. Use the Fire Toolbox DPI change only when the stock setting is not enough. Change DPI in small steps, and write down the starting value before you change it, so you can move back toward the old look.

Change the bar and DPI with Fire Toolbox

Set up Fire Toolbox on Windows first. See how-to-set-up-fire-toolbox and download for the setup steps. Connect the tablet with a USB data cable, unlock it, and wait for Fire Toolbox to detect it. Back up anything you care about first, as with any display or system change. See how-to-backup-and-restore-fire-tablet for backup steps.

In Fire Toolbox, find the tools for the navigation bar and for DPI. Change one item at a time: change the bar, test it, then change DPI, test it. Do not unplug the cable during a change. When the step is done, test at once: home screen, an app, back, and recent apps. If buttons are cut off or text overlaps, the DPI value may be too extreme for that app. Move DPI back toward the old value.

Restart the tablet once after you settle on values you like, to confirm the change holds. Use the tablet normally for a day before you call the change final.

Undo a change you dislike

To undo a navigation bar change, open Fire Toolbox again and return the bar to its default, or choose the layout you had before. Test back, home, and recent at once. To undo a DPI change, return DPI to the starting value you wrote down. If you did not write it down, move DPI in small steps back toward a normal look, testing after each step, until text and buttons feel right again. Restart after the undo and test the home screen and a few apps.

If the screen becomes hard to use after a DPI change, connect the tablet to Fire Toolbox again and undo the change from the PC. If that fails, factory reset is the full fallback, as described in how-to-uninstall-fire-toolbox-and-restore. That fallback wipes data, so the backup step matters.

Restricted firmware and other limits

Gen 13 tablets from 8.3.1.9 onward, and Gen 12 to 8 tablets from 7.3.2.2 onward, are restricted. On restricted firmware, some launcher, over-the-air update, and ad-removal functions are limited. Navigation bar and DPI changes can also behave differently by model, so read the tool screen for your tablet and test carefully after each change. If you use a custom launcher, check the launcher after a DPI change too, because launcher grid and icon size can shift. See how-to-change-fire-tablet-launcher if the launcher layout needs a fresh look after DPI changes.

The author says it does not touch the system partition and changes can be reversed or factory-reset; Amazon has not promised this. A soft-brick is possible, for example a stuck boot screen or repeated launcher crashes, and factory reset is the fallback. Display changes alone are low risk, but keep the undo steps above in mind and back up before you start.

FAQ

Will a DPI change break my apps?

Most apps adapt to a new DPI, but a few apps with fixed layouts can show cut-off buttons or overlapping text at extreme values. Move DPI back toward normal in small steps if an app looks broken, and test that app after each step.

Can I hide the navigation bar and still go home?

Yes, if you learn the replacement method first, such as a gesture or a floating button where offered. Test the new way home before you rely on it, while Fire Toolbox is still connected so you can undo the change quickly.

Should I change DPI or use the stock display size first?

Use the stock display size in Settings first. It is simpler and safer. Use the Fire Toolbox DPI change only when the stock setting is not enough for your needs.

Do bar and DPI changes survive a restart?

They should, after a clean change and a restart test. If a change reverts after restart, re-run the tool in Fire Toolbox and check that you completed every prompt. An Amazon update can also reset display changes, so re-check after updates.