Problems selecting from dropdown menus in graph builder on MAC

[marpet]

Maybe you can switch to a different Look and Feel as described in this post:

Unable to Open or Save to External Hard Drive on Mac

This is indeed an issue on Mac. There are two workarounds possible: Drag’N’Drop the target directory of the other hard drive onto the open/save dialogue. Switch to the Nimbus Look-And-Feel. Select in the menu snap / Preferences and then change under Appearance the LAF. [LAF_in_Prefernces]