Bottom bars in frame is not seen in presentation tab

[Surashree_Ganpatye]

I am working on IOS screen for a payment app. I have drawn bottom menu and navigation bars on screen. Top status and app bar is seen in the present mode but bottom bars are not seen.
Also I would like to know how to preview a mobile mockup screen on present tab.

Please help

[Gleb]

Fix Position when scrolling causes frames to disappear

If you set constraints correctly, nothing will disappear. Constraints control which side of the screen is used when fixing the content relative to it. So if your item is somewhere at the bottom of the long scrolling list (y = 1500 for example) and you set its constraints to Top — it will be fixed relative to the top, at y = 1500, which is outside of the visible screen.