Clarification on using "Show until end"

Hi

I am using screen recordings to demonstrate software steps and trying to work out when I should/should not use this option.  Logically, my head says use it all the time, but sometimes when I have tried it by setting it for my screen recording things go a bit odd, with captions staying on-screen into the next slide!  To resolve this, I have to then reduce the timeline for captions which results in colleagues finding everything going too fast.

Questions:

1.  When should I use 'show until end'?

2.  Does show until end mean until the end of the screen recording or until the end of my timeline?

3.  Should I just use it for the screen recordings?

Thanks.

Dorothy