Can't see subject or correspondents in incoming email

I’m getting incoming email, but the the window for the emails is blank until I touch it. I have checked the select messages on the the upper right to show correspondents, date, but still nothing shows up.

Test for a broken layout by running in safe mode (Help/Restart with add-ons disabled). If it looks OK, start again in safe mode, ‘Reset toolbars & controls’, ‘Make changes and restart’.

Thank you so much. It looks like you resolved my problem🤗