Thank you for contacting us.
Actually, this is a known issue and you could track its state from the following feedback item: Comments are collapsed in Flow layout mode
. The reason behind it is that there is not enough space to display the whole comment.
Unfortunately, this issue is with a fairly low priority and I cannot give you any time frame when the fix will be available as currently we have higher priority tasks in our backlog.
As a workaround, I would suggest you try to increase the line spacing before so that there will be enough place to display the whole comment.
I hope this helps.
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and share your thoughts.