Missing border

Hi colintemlett ,

If you change the Zoom setting in your web-browser the borders will appear.  For example change the Zoom from 100% to 80%. And you could download pbix file to check if the borders  could view by using Power BI Desktop.

Similar error refer:

https://powerusers.microsoft.com/t5/Building-Power-Apps/Some-borders-missing-in-Custom-form/td-p/389023 

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Best Regards

Lucien