UI for "browser-specific" API list is pretty much unusable

STEPS TO REPRODUCE:

1) Load https://web-confluence.appspot.com/#!/confluence
2) Click the "Browser-specific" tab (I don't see a way to link to that directly).
3) Click a point on the graph (e.g. the last one for Firefox).
4) Click the little box-with-an-arrow icon to get to the relevant API list. It's a [long url](https://web-confluence.appspot.com/#!/catalog?releases=%5B%22Chrome_69.0.3497.92_Windows_10.0%22,%22Firefox_62.0_Windows_10.0%22,%22Safari_12.0_OSX_10.13.6%22,%22Safari_12.0_OSX_10.14%22,%22Chrome_70.0.3538.67_Windows_10.0%22,%22Firefox_63.0_Windows_10.0%22,%22Edge_18.17763_Windows_10.0%22,%22Chrome_71.0.3578.80_Windows_10.0%22,%22Firefox_64.0_Windows_10.0%22,%22Chrome_72.0.3626.109_Windows_10.0%22,%22Firefox_65.0_Windows_10.0%22,%22Chrome_73.0.3683.86_Windows_10.0%22,%22Firefox_66.0_Windows_10.0%22,%22Safari_12.1_OSX_10.13.6%22,%22Safari_12.1_OSX_10.14.4%22,%22Chrome_74.0.3729.108_Windows_10.0%22,%22Firefox_67.0_Windows_10.0%22,%22Chrome_75.0.3770.80_Windows_10.0%22,%22Firefox_68.0_Windows_10.0%22,%22Firefox_68.0_Windows_10.0%22,%22Chrome_76.0.3809.87_Windows_10.0%22%5D&q=%22in:fir68.0win10.0%20in:fir62.0win10.0%20in:fir63.0win10.0%20in:fir64.0win10.0%20in:fir65.0win10.0%20in:fir66.0win10.0%20in:fir67.0win10.0%20notin:chr69.0win10.0%20notin:chr70.0win10.0%20notin:chr71.0win10.0%20notin:chr72.0win10.0%20notin:chr73.0win10.0%20notin:chr74.0win10.0%20notin:chr75.0win10.0%20notin:chr76.0win10.0%20notin:saf12.0osx10.13%20notin:saf12.0osx10.14%20notin:saf12.1osx10.13%20notin:saf12.1osx10.14%20notin:edg18.17763win10.0%20%22).

EXPECTED RESULTS: Can look through the list to see what the APIs are

ACTUAL RESULTS: All the columns, including the API column, are really narrow, so it's impossible to see what the APIs are. Trying to close any of the other columns doesn't work, because hovering over them expands the name in the header, moving the "x", and trying to then move to the "x" re-collapses the header, so I can never click on the "x".