Help! with empty space on my DM screen

Nearly finished with my initiative tracker, and I realized that there's not enough space for the index card holder (rightmost, index card for scale) that was supposed to have Magic item stats, Homebrew Rules, etc. that I was planning.

What else can I place here? Feels wasteful to keep that entire quadrant just for the initiative tracker. I'm a first time DM and I've only played for a total of 5 sessions for different friend groups, different campaigns and I know what mechanics I keep forgetting, so I don't need any more of those.