In SOLIDWORKS 2020, you can set the dimension characters or hole callouts to show as all uppercase characters in the graphics area for drawings. This can be done for a single dimension by selecting that dimension, going to dimension property manager, and clicking on All Uppercase for that dimension.
You can also set this option for all new hole call outs and dimensions by changing the document properties. In order to do this, you can go to Tools > Options > Document Properties > Drafting Standards for any part, assembly, or drawing document. From here, under Uppercase, select All Uppercase for dimensions and hole callouts.