---
title: "Fix Fullscreen Titlebar & Borderless Window Tweaks Not Working or Resetting in Bloxstrap"
description: "Troubleshooting steps when Fullscreen Titlebar & Borderless Window Tweaks (ClientAppSettings.json) does not apply or resets after a Roblox update in Bloxstrap."
canonical: https://bloxstraplabs.ink/mods/remove-fullscreen-titlebar-not-working-fix
updated: 2026-10-17
---

# Fix Fullscreen Titlebar & Borderless Window Tweaks Not Working in Bloxstrap

Step-by-step fix if Fullscreen Titlebar & Borderless Window Tweaks fails to load or gets overwritten in Roblox on Windows.

## Facts (2026-10-17)

- **Target Mod:** Fullscreen Titlebar & Borderless Window Tweaks
- **Menu Toggle:** Mods / Engine Settings
- **Asset Target:** ClientAppSettings.json

## Why Fullscreen Titlebar & Borderless Window Tweaks stops applying

If [Fullscreen Titlebar & Borderless Window Tweaks](https://bloxstraplabs.ink/mods/remove-fullscreen-titlebar) does not appear in-game, either Roblox is still running in the background while you saved settings, or a conflicting file inside `%LocalAppData%\Bloxstrap\Modifications` is overriding `ClientAppSettings.json`.

Close `RobloxPlayerBeta.exe` completely in Task Manager before clicking **Save** in Bloxstrap Settings so the bootstrapper can write the file on the next launch.

## 3-step repair checklist

1. Open **Bloxstrap Menu** → **Mods / Engine Settings**, toggle the option off and back on, and click **Save**.
2. Check [Open Mods Folder](https://bloxstraplabs.ink/mods/custom-content-mod-folder) to verify no corrupted 0-byte file sits at the same relative path.
3. Ensure you are launching Roblox through Bloxstrap (or update your install from [/download](https://bloxstraplabs.ink/download)) rather than the Microsoft Store app.

## FAQ

### Why did my mod disappear when I launched from the browser?

If the official Roblox updater overwrote your protocol handler, launch **Bloxstrap Menu** once and click Save so Bloxstrap re-registers `roblox-player://`.

### Does Bloxstrap need administrator rights to apply this mod?

No. Both Bloxstrap and Roblox live inside your user `%LocalAppData%` directory, which is writable by standard Windows accounts.

## Related

- [Fullscreen Titlebar & Borderless Window Tweaks](https://bloxstraplabs.ink/mods/remove-fullscreen-titlebar)
- [Bloxstrap Mods & File Customizations](https://bloxstraplabs.ink/mods)
- [Fix Bloxstrap Not Opening or Launching Roblox on Windows](https://bloxstraplabs.ink/launch/bloxstrap-not-launching-roblox-fix)
- [Bloxstrap Windows Setup & Installation](https://bloxstraplabs.ink/setup)
- [Classic 'Oof' Death Sound](https://bloxstraplabs.ink/mods/old-death-sound-oof)

## Download

Free Windows app: [Download Bloxstrap](https://bloxstraplabs.ink/download)

Markdown mirror: https://bloxstraplabs.ink/mods/remove-fullscreen-titlebar-not-working-fix.md