Glitching how?

It's not hard to figure out how make changes, example I want A to be B, so change A to B that was it, that all there was to it, same process if want controller be tied to keyboard & mouse it say exactly what it be doing.

IDK if you mess with desktop layout or guide button chord layout, but if you did, this what you do, go to Steam settings > controller tab > scroll to the bottom, you see NON-Game Controllers Layouts, and you see two settings, click on GEAR icon, and click RESET for both.

For games own controller settings, as each game has it own settings on steam, view the game in your steam library on steam client, click on controller icon, or right click game in library, then click properties > controller > click on text controller configurator to open the game controller settings used by steam. From here you see a window pop up, assuming have this enable you should see "current button layout" click on big long button this take you to layouts, click on the recommended template this is set by default or game dev default configuration, now click apply, and this should RESET to what it was for the game using Steam input controller.

Note games has their own controller settings as well in-game this can vary so have to go into game own settings to see what you did there, if they have reset option, or not.

Games that don't natively support controllers, this can always be iffy because you're trying to make it support controller, which why it iffy, so have to figure out, and some people do make custom layouts, and upload to share with others. So if want to give that a shot, it same thing for "recommended template" but instead doing that, you click on community layouts, and see what people upload for their configs.

thank you!