"The game crashes as soon as I select a level." Solution: You have too many overlapping hacks enabled. Turn off "No Clip" and "Speed Hack" simultaneously. Also, ensure you aren't using the "Unlimited Objects" feature on an official level.
If you choose to download it, do so with your eyes open. Keep a backup of the official APK, scan every file for viruses, and never connect your real Google Play account to the modded version. Geometry Dash Mod Menu By Italian Apk Downloader
"My icons reset every time I close the app." Solution: You did not grant Storage permission. The mod needs permission to write the CCData and CCLocalLevels files to your internal storage. "The game crashes as soon as I select a level
"The menu icon appears, but clicking it does nothing." Solution: The overlay permission was denied. Go to your phone's App Settings > Geometry Dash Mod > Permissions > Enable "Display pop-up windows." If you choose to download it, do so with your eyes open