Adjust Astra timeline to select a section to render

how do i adjust the timeline in astra to select a different part of the video to render?

Right now i can only have the first 18 seconds.. but i want to do 19seconds and on .

You are likely hitting the max render limit:

Creative mode has a 450 frame limit

Precise mode has a 9000 frame limit

If you need to render more, you’ll need to render them in separate parts and stitch them back together in an editing app.

I understand that, but being able to select another section to render with the slider would be super convenient. like in and out points

Can you let me know if you are still running into this issue? There should be a trim feature as shown in the screenshot below

This is extremely cumbersome and reduces usability; why not execute longer segments at once if you have enough credits?
If I were to make a 5-minute short film, it would require 20 executions, and it would be difficult to make precise selections manually.