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Activity Monitor suddenly not showing the columns under the headings.

Never seen that problem during over 20 years on Macbooks.


How to fix that? Cannot find a way to update or reinstall the Activity Monitor app.


Running MacOS Catalina 10.15.5 on MacBook Pro (13-inch, 2017).


Posted on Jun 11, 2020 1:18 AM

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Question marked as Top-ranking reply

Posted on Jun 11, 2020 2:26 AM

They are there however may be moved (and hidden) to the extreme right. Open Activity Monitor and widen the window to the right until you see at least one column. Drag that column to the Left and the other related columns should follow..


Axel F.

3 replies

Activity Monitor suddenly not showing the columns under the headings.

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