RPGMaker MZ games (which run on a platform called NW.js) rely on web-based rendering technologies. The black bars you're seeing are rendering artifacts, suggesting the graphics driver or a recent Windows update has broken how these games are drawn on your specific hardware.
Here are the most likely solutions, from easiest to most effective.
How to Fix the Rendering Issue
Start with step 1, as it's the most common culprit for this exact problem on Snapdragon devices.
1. Adjust Windows Graphics Settings (Most Likely Fix)
Windows 11 tries to "optimize" games, but on ARM devices, this can sometimes backfire. You need to force the game to run using the correct performance profile.
- Go to Settings > System > Display.
- Scroll down and click on Graphics.
- Under "Add an app," select Desktop app and click Browse.
- Navigate to the game's folder (e.g., "Slice of School") and select the main executable file (like Game.exe).
- Once the game is added to the list, click on it and select Options.
- In the pop-up, set the graphics preference to High performance (Qualcomm Adreno 618).
- Click Save and try launching the game again.
2. Disable Optimizations for Windowed Games
If step 1 doesn't work, this new Windows 11 feature is the next setting to try.
- Go back to the main Graphics settings page (Settings > System > Display > Graphics).
- At the top, click the link that says Change default graphics settings.
- Turn the toggle for Optimizations for windowed games to Off.
- Restart your computer and try the game again.
3. Update or Roll Back Your GPU Driver
Since this happened "suddenly," a recent driver update pushed through Windows Update is a prime suspect.
- To Update:
- Go to Settings > Windows Update.
- Click Advanced options > Optional updates.
- If you see any "Driver updates" (especially for Qualcomm or graphics), install them and restart.
- To Roll Back (If the problem started after an update):
- Right-click the Start button and select Device Manager.
- Expand the Display adapters section.
- Right-click on Qualcomm Adreno 618 and select Properties.
- Go to the Driver tab.
- If the button is available, click Roll Back Driver and follow the prompts.
4. Try Compatibility Mode
This is a simpler fix that can sometimes bypass rendering issues.
- Find the game's .exe file.
- Right-click it and select Properties.
- Go to the Compatibility tab.
- Check the box for "Run this program in compatibility mode for:" and select Windows 8.
- While you're there, also check the box for "Disable fullscreen optimizations".
- Click Apply and OK, then try launching the game.
I'd recommend trying these steps in order. The graphics performance setting (Step 1) is the most likely to resolve this specific issue on your Galaxy Book Go.
Would you like me to walk you through finding the game's .exe file?