You can hide “Task” in Message in the following way.
<Desktop>
1. Click “Settings” in the upper right corner and “Your name”.
2. Click “Other personal settings” and set “Not display” in ‘Do you want to display “Updated Task info in Messages”?’.
<Mobile>
1. Tap “Settings” on footer and “Other personal settings”.
2. Set “Not display” in “Updated Task info in Messages”.