Each time the launcher is opened it appears slightly further to the left than it was when it last closed. Over successive openings this moves the launcher off-screen where it is difficult to recover.
This is the apparent root cause of some people reporting the launcher as having disappeared off-screen.
Thank you for your report!
However, this issue is a Duplicate of MCL-6629.
It has been linked to this report. If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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