Is subtitling possible with Shotcut?

[shotcut]

No, see

How to keep text size static?

No. Also, regarding the text size, you need to keep in mind that the Size parameter will also be a limiting factor affecting the text size. If you change the text in the screenshot you show to add more words, it does not wrap and instead the text size eventually shrinks to fit all of the text within the rectangle (Size). Your options are: Make the Size bigger (not font size) and use the Position, Horizontal fit, and Vertical fit to control the placement. Use Text:Rich, which does not auto-ad…