I think that you are referring to the WAB (Work Area Bar), but I do not understand what it is, that you want to do with the WAB. Can you elaborate a bit.
Thanks, and good luck,
If I read the question correctly, the answer is no. Once you manually adjust the Work Area Bar, it will not thereafter resize automatically.
If you meant that you want to export the whole timeline and you have to spread those markers...?
Premiere's Export settings panel has a Source Range: selection, if you have adjusted those markers it tries to export Work Area.
You can specify the range to export to "Entire Sequence".