I'm launching directly into .next from it's exe, the welcome screen greets me, I click the X. Details are closed by default, I left click a game, regarless if I right click or Ctrl+D I get the blank/transparent panel on the right. I was mistaken in saying the game is unselected, I just tried some games in the top left so they couldn't move off screen and appears it stays selected, but I actually can't click it again to get the details I have to click another game then back.
*Edit. I just tried closing details, and changing platform / playlist. reopening details in the new playlist/platform gives me the same problem again without relaunch.