Make a BURN-IN caption window and a CLOSED CAPTION window.
I don't burn in captions but i do make closed captions that a tv viewer can turn on or off. The Premiere 2021 captions is not useable.

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james wise commented
When i type a closed caption in premiere 2021 i dont see the usual 608 layout. i see text that would be good for burned in caption. if i restart premiere then i see normal 608 caption as in premiere 2020 but it is not in the right place and the burn in caption is also there. if i try to adjust the position of the 608 caption nothing happens...but the burn in caption moves. if i want to see a change i have to restart premiere. i embed captions. i dont use burn in or side car. it would be better to have 2 caption programs and then one could choose which one to use.
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Trent Happel commented
Could you please provide more details on what you are looking for?
We currently allow export of sidecar Closed Captions for all of our exporters and we allow embed of Closed Captions with QuickTime export (608 only) and any of the MXF OP1a exporters (608, 708 and Australian OP-47)