How to Greyed Out selected field in List Form

[newbiesSP]

Im trying to set some field locked or read only during Sharepoint List Form. 
Only selected field can be editable

[#2 · Accepted solution]

@newbiesSP 

By default only calculated columns in SharePoint will be disabled/grayed out on list forms. If you want to disable other type of columns, you cannot do it using SharePoint out of the box options.

You will have to customize the list forms using Power Apps and then disable form fields by changing DisplayMode property to: 

DisplayMode.Disabled

Check:

1. Customize a Microsoft Lists or SharePoint form by using Power Apps 
2. Disable list form fields in edit mode 

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