1

Scenario:

  1. Open the list which has a lookup field.
  2. Click on 'Customize forms' command under 'Power Apps' in the command bar at the top.
2

Yes, it is possible.

You can customize the SharePoint list which has lookup columns in it.

Here are the examples of others using lookup columns while customizing list forms:

  1. Create(customize) Form for Sharepoint list (auto population based on lookup)
  2. PowerApps Tip: Setting a SharePoint List Lookup Column
  3. Customize SharePoint Forms With PowerApps

Update:

If you are not able to customize the list forms using "Customize forms" option in command bar, follow below workaround:

  1. Go to SharePoint list
  2. Click on Settings icon and select List settings
  3. Select Form settings
  4. Click on Customize in PowerApps under Use a custom form created in PowerApps (requires new list experience)

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5
  • I have a simple test list. As soon as I add lookup field click on 'Customize forms' does not do anything. What I am doing wrong? – mkalai Apr 6 at 13:12
  • I am also facing the same issue on my tenant today. Even for newly created list with only Title column, I am not able to customize list forms using Power Apps. – Ganesh Sanap Apr 6 at 14:39
  • 2
    Check my updated answer for workaround to customize forms using Power apps. Please Upvote(^) and accept as an Answer if it helped you. – Ganesh Sanap Apr 7 at 4:47
  • My problem was that Power App was not launched when I clicked on 'Customize forms'. I found that after refreshing the page it started loading. I seems nothing to do with lookup column. Thank you for tackling my issue. I understand that it was vague. – mkalai Apr 8 at 13:33
  • Yes, same problem for me. But you can customize list forms using 2 ways: 1. Using "Customize forms" from command bar. 2. workaround given in my updated answer. It's always good to know multiple ways to work with (if first option does not work). – Ganesh Sanap Apr 8 at 15:43

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