Common Windows + X2Go Resolution issues:

Fix 1:

(1) click on the System setting in the upper left corner of the X2Go desktop.
(2) Open the Preferences
(3) Find the look and feel option.
(4) Find the appearance setting.
(5) Click on the fonts tab at the top of the window and adjust the size of everything from 9 down to 5.

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Fix 2:

https://lists.x2go.org/pipermail/x2go-user/2018-February/004832.html

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Fix 3 (Gaussview Issue):

In the Gaussview Windows Settings tab, in Display, the Scale and Layout option must be set to 125% or less. The default 150% causes the bottom of the Gaussian window to clip off.