I play on a TV and it's just more comfortable for me to use a controller most of the time.
Steam > Settings > Interface
Toggle "Start Steam in Big Picture Mode"
Use google.
Typing the exact same words gets you the exact answers posted here, and doesn't clog up peoples feeds and the sub with support questions that you already have easy access to.
🤓
Settings>Interface>Start Steam in Big-picture mode
Thank you and Happy Cake Day!