I have been experiencing several display issues with various dialogs in FMPA 16 since moving to Sierra & High Sierra.
1) My first issue are with the inspector size field not updating when moving an object or simply being blank. It is hard to post a screenshot of this since it really needs to be seen in action. This issue really slows down development.
2) Export Records (or any Save) dialogs - The file options are missing from the initial dialog, then appear when you click the toggle to the right of the file name. Then if you click the toggle again, the file options stay on the screen but the file list is very small. See the attached screenshots.
I have recreated this issue using the following combinations:
OS X 10.12.x - FMP 16v1, 16v2, 16v3
OS X 10.13.2 - FMP 16v1, 16v2, 16v3
The only reason I went from OS X 10.12.x to 10.13.2 was to see if these issues would be corrected. They haven't.
Let me know if you need anything from me to further troubleshoot.