On my laptop with a 13" 1440p screen and vertical panel the two size options
are "Small" (too small to see the power level) and "Scale with panel width"
which uses too much screen space.  I think we need a medium option, maybe
"Scale with half panel width".

I'll attach screen-shots showing the differences after the bug report is
created.

settings.png shows the configuration options I'm given.

small.png shows the result of setting small, from the pixel layout you can see
this isn't very readable text for the battery charge level.  It's possible to
work it out but not at all clear.

panel-width.png has the full panel width.  It's quite readable but the
vertical size is significant.  420 pixels out of the 1440 total.  If I made
the panel slightly wider to make the task manager entries easier to read then
it would increase the height even more.