Hey! Ogur Bear,
* One possible solution for this issue is to open up your 3DS XL and check the R button mechanism for any damage or debris that might be preventing it from being fully pressed down. If you are not comfortable with opening up your device, you can take it to a professional repair service to have it fixed.
* Another option is to try cleaning the button using compressed air or a cotton swab and rubbing alcohol. This might help remove any dirt or debris that might be causing the issue.
* If none of these solutions work, it might be necessary to replace the R button altogether. Replacement parts can often be found online or through a repair service.