To fix your screen capture issue, follow these steps:
1. Go to Settings > Apps > Installed apps.
2. Find Snipping Tool in the list.
3. Select the three-dot menu next to it.
4. Click on Advanced options.
5. Choose Reset > Reset on that screen.
6. Wait for a few moments for Windows to reset the program.
Another option is to enable the Print Screen shortcut, check for interfering background programs, try different hotkey combinations, use an alternative application like Movavi Screen Recorder, or update your keyboard driver.
For more details, refer to the provided links.