Method 1. The fastest way is via a Spotlight search and taps the app's icon below “TOP HIT”. On the upper left corner, choose Messages> Preferences. Hit the “Accounts” tab. Under iMessage array, pinpoint the Apple ID (s), toggle off and deselect them.
In the Messages app on your Mac, select a conversation. Click the Details button in the top-right corner, then select Hide Alerts to stop notifications; to get message notifications again, deselect Hide Alerts.
Hide apps on your Mac
How to hide photos on your Mac
This can be done by clicking the Apple logo in the top left, then System Preferences. In the menu, click View then Customize. Click the checkmarks next to icons you want to hide to uncheck them. Alternately, add a checkmark in the box next to hidden icons you want to be visible.
Method 1: IG:dm
In the Messages app on your Mac, click in the search field in the top-left corner of the sidebar. Do one of the following: Choose a category: Select a conversation, photo, location, and more to quickly find a conversation.
To unpin a conversation, drag it out of the section or Control-click it, then choose Unpin.
To hide the tab bar, select View > Hide Tab Bar.
How to customize Notifications for the Messages app on Mac
How to Forward Text Messages to Your Mac
In the Messages app on your Mac, select a conversation. Do any of the following to delete one or more messages: Delete messages: Select one or more messages (including text messages, photos, videos, files, web links, audio messages, or emoji) in the transcript, then press Delete.