I had a similar issue when I started using a mouse and keyboard with my Series X. I went into the General-Accessiblity menu and turned on the much hated tool tips to help me out. For my mouse - with a clickable scroll wheel - I hover over the altitude button and it goes blue. I hold left mouse button down - button goes yellow and right click to PUSH and click scroll wheel to PULL. This might differ slightly depending on how you have your mouse configured but its worth a try. I tried this on the baro pressure adjustor as it clearly states “ Pull STD”. You then know for sure which button pulls as it will display Std and fron there you should be good to go.