Dear Azaga,
Good day! Thank you for reaching out to the Microsoft Community. We are here to assist you.
I understand that you are having trouble with the copy-paste function in SharePoint's Grid view. Previously, you could copy a row by selecting it and pressing Ctrl + C, which highlighted the row with a dashed red line. Now, this no longer working for you. However, in my test lab I am successfully able to copy and pest the items.
Here are a few steps you can try based on that discussion:
- Check Column Settings: Ensure that the columns you are trying to copy are not set to "Rich text." If they are, try changing them to "Enhanced text" and see if that resolves the issue.
- Validation Rules: Verify if there are any validation rules or column settings that might be interfering with the copy-paste functionality.
- Browser and Account: Try using a different browser or a different user account to see if the issue persists.
- Clear Cache: Clear your browser's cache and try the copy-paste action again.
We found a similar thread about your query, please have a check if the answer in the thread to see if it's fit your situation. For your reference: Not all columns are copying in SharePoint online list using the grid - Microsoft Community
Note: the three options of "Multiple lines of text which op mentioned in the thread from>list settings>Columns>find the multiple text and click it, then the page will disappear for the 3 options settings.
If the scenario above is not consistent with yours, you can also post back and point that. Please notice the above information is vital for us to further assist you, any updates please feel free to post back.
Your understanding and patience will be highly appreciated. I hope that you are keeping safe and well!
If these steps don't resolve the issue, it might be helpful to raise a support ticket with Microsoft for further assistance.
Have a great day and take care! 😊
Sincerely,
Naren | Microsoft Community Moderator