Main vertical open tabs button, when used opens tabs at halfway. 2mo ago, never. Ever did that. Have restarted and left powered off for multiple times and over night. 0 fix. Very annoying when trying to be fast when using phone for work & play.
Think that's the default in One Ui 7. You need to get good lock app from the galaxy store then get the home up module. Open home up and then enable task changer and then turn on centre the currently running app 
