As Nimbleswitch said, it will automatically add a right barline at the end of a system when you insert one at the beginning of the next system. If you want any other barline at the end (double, final, repeat) you will have to change to Symbols for all the choices.
You should be able to copy the flat or sharp symbol from the chord box then paste into the text box. I have not tested this extensively to see if there are any (bad) consequences in doing this, but it seems to work in my quick tests.
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