ActivePresenter uses MathML to create Equations.
This is a hack, but you can open the .approj file in a text editor and change the MathML manually. Be VERY CAREFUL not to change anything else.
Make sure that you don’t have the file open in ActivePresenter.
Open the approj file in a text editor like notepad.
Search for <mathml
Now look for your units (e.g. cm)
Here is how they will likely look:
The problem is that each letter is being treated like a variable and single letter variables in mathml are always represented in italics.
A simple fix is to make it all one variable:
Alternatively, make it regular text:
Save the file, again being VERY CAREFUL not to change anything else.
Hope this helps!