Dear adobe, please add a 75% zoom distance for the Magnificaition ratio popup. Goign from 50% to 100% is way too drastic of distance, so 75% is a nice sweet spot.
You can always use Fit and then adjust the Comp Panel size to be as big as you want it to be. 100% is required to check the pixel grid precisely, but something close to 75% is easily attainable by simply setting the Magnification Factor to Fit. If I want to see the timeline, the best I can get on my MacBook Pro is about 71%. That gives me one layer visible in the timeline.