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I own a 40" 4K screen which has a resolution of 110 dpi. When I click on
"Online Update" or several other entries in Yast2, a really huge screen with a
size of 2688x1481 opens.

Such a size might be useful on retina-like displays with really small pixels,
but is just nasty on a large screen with (almost) usual dpi-numbers.

Reproducible: Always

Steps to Reproduce:
1. Grab some 40" 4K-Monitor
2. Start Yast2
3. Click on Online Update (or any other menu entry)
Actual Results:  
==> Really huge screen with a lot of unneeded space

Expected Results:  
A reasonable smaller one, maybe depending on the font size (x times the width
of character 'o' and y times the height of the characters). 

Yes I know, this is a typical first world problem. But it is an annoying one.
Since large displays are not so expensive anymore (mine was less than 600 ���),
they will be used more an more in the near future.