Is that Window 10 1909, or a previous version?
Can’t say for sure James, but on 1903 that issue is not there. I have purposely delayed the feature update to 1909 because of the general problems associated with that version. Maybe after the next patch day I will put it on a test machine and see if I get the same issue.
As always, if you are not using the latest version of eM Client, you can download it manually from the Release History.