Export UI could be better

[jimk-bdrc]

Environment: MacOS Instel, OS X 14.3
Run from python -m main 2>&1 | tee ~/dv/tmp/Projects/tibetan-ocr-app/output.log

I OCR a page, and select the 'Save output' tab. I select the 'Select label, and choose a directory. I then choose an output format and select the OK button. The app creates the files in the output directory.

What I expect to happen

1. I expect the format selection ('Wylie',' text',' Unicode....') to be highlighted in some way that indicates I have clicked it.
2. The next time I want to export, I expect the prior directory selection to appear in the input box and be used for the next output run.

What actually happens

1. The format selection is not indicated
2. The directory must be re-selected.