The standard system Look and Feel causes several issues on Mac systems.
Those issues can be solved by switching to the Nimbus LaF by default.

The issues have been reported in the forum.

• https://forum.step.esa.int/t/problems-selecting-from-dropdown-menus-in-graph-builder-on-mac/24843

• https://forum.step.esa.int/t/unable-to-open-or-save-to-external-hard-drive-on-mac/10502

• https://forum.step.esa.int/t/illegible-text-on-processing-parameters-tab-of-calibration-tool/18787

The default start-up LaF can be changed by specifying on the command line

-Dswing.defaultlaf=javax.swing.plaf.nimbus.NimbusLookAndFeel

See also:
https://docs.oracle.com/javase/tutorial/uiswing/lookandfeel/nimbus.html