How to match export format to source format?

[shotcut]

@Steve2

I see all the format details (resolution, fps etc). But how can I copy these and apply to set the export format?

You can use the Automatic Video Mode

Video Mode

Introduction Video Mode is the project resolution, aspect ratio, frame rate, and color space. It is important to set this as you desire at the beginning of your project. If you try to change it later Shotcut will try to retain the timing of edits, but some users have reported problems, and it is risky. Also, at this time Shotcut will not automatically adjust anything for you related to size and positioning of elements like text and picture-in-picture when changing resolution. You can think of…

You can even switch it to that or reselect after the clip is already open but only if there is not playlist or timeline.

Is it true that this happens only on the first instance since program start

No, if you start with Automatic, opening a project restores the project video mode. Then, closing returns it to Automatic.