We're glad to have you join us here in the Roku Community, @AlexFTL0526!
You've raised a good suggestion! Changing the picture size during playback could be a little tricky, and we completely understand that.
We value your opinion and we care about your experience. No worries; we'll take this as feedback and pass this on to the appropriate team. Thanks for informing us about this.
If you need more help, please let us know. We're always here to assist.
Best,
The Roku Community Team
Emmanuel-D.
Roku Community Moderator