SUMMARY The panel, when more than full, used to have drop-down lists of instances of any program. It seems these have been removed, and replaced (on a normal non-icon-only task manager) with having to continue to select a program icon/name several times to step through all the programs, which is extremely inconvenient, and basically unusable in the case you might have tens of instances (yes, I do that sometimes.) STEPS TO REPRODUCE 1. Open programs to fill panel. 2. Open more of one program. 3. Look for the normal drop-down list of instances: no longer there. OBSERVED RESULT Forces you to step through (with mouse button) each instance without a list: extremely mouse-heavy. EXPECTED RESULT Just allow the normal drop-down list. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Slackware 14-current/5.20.2 KDE Plasma Version: 5.20.2 KDE Frameworks Version: 5.75.0 Qt Version: 5.15.1 ADDITIONAL INFORMATION
Also when I said 'allow,' I do not mean 'replace,' which one of my suggestions for KDE4 was misinterpreted as, to the dislike of several/many people (and later myself.) It's okay to have more options.
You can configure the behaviour when clicking a grouped task in the Task Manager settings.