Shrinking or removing players photos / videos?

I'm very new to roll20, so I'm sorry if this has been asked, or if the answer is obvious. I ran session 0 for my Icewind Dale game last night.  Challenge 1 was that some players were having trouble getting audio and video to work.  I ended up with two of my players on speaker phone and me holding my phone next to my laptop.  Challenge 2 was that we have 6 PCs - 7 of us, including me - so the screen was very cluttered with players pictures / videos.  I anticipate this will be a nuisance once we get to battle. I'm considering using something else for audio in the background while we play, and using roll20 for maps, images, rolls, etc etc.  Is there a way to get rid of - or at least shrink - the boxes with all of our videos / backgrounds at the bottom of the screen? Thanks much in advance.

In the settings tab Player Avatars: Names Only. My games use Discord for voice. The Roll 20 audio always fails for 20% of the players in my games, not always the same ones.

Go to the "My Settings" tab (gear icon at the top right of the chat window) and scroll down to the bottom. You can set "Player Avatar Size" to Large, Regular, Small, or Names Only. (I have mine set to Names Only.) On that same tab, you can set whether or not you want to broadcast and receive voice and video. Many groups including mine use a separate service for that--in my group's case it's Discord voice and text chat--so if one system is having trouble the group can use the other one.

Fantastic.  Thank you both.