I have a horizontal panel at the bottom Now I want to remove an applet. I click on the right panel handle to show the extra area having the "Add Widget, More Setting, etc." buttons in it (don't know how that is called). Now let's just remove the clock applet, which is to the left of the panel handle I just clicked, so I move the mouse over the clock and a "handle" slides upwards which contains the "close" button for the clock. I now move the mouse onto this handle and BANG - it just slides away downwards before I could reach the "close" button.
Workaround: right-click and select "Remove this <widget" instead of trying to get to the 'close' button.
Interestingly this option is not available when right-clicking on the task manager applet.
Yep, only works if you right-click on the empty space. Same for systray. The button is intercepted by the applets regardless of the panel configuration mode.
Can't reproduce in: Distribution: KDE neon Developer Edition - Stable Branches Plasma: 5.11.3 Frameworks: 5.41.0 Qt: 5.9.2 Kernel 4.10.0-38-generic Type: 64-bit
Since I already have my own desktop shell, liquidshell, I don't care any longer.