Is there a way to select & delete multiple conversations on iMessage?

IgorPiedade wrote:

Guys,

Has been a while that I'm seen people asking about how to select and delete multiple conversation on iMessage.

Didn't apple still put an attention on update the software to enable multiple select ?

Also, iMessage should spread actions across all devices. Like: if I delete a message on my iPhone, it should delete from my MacBook Air and my Mac mini too.

It will if the user availed themselves of the useful information in below link

Set up iCloud for Messages on all your devices - Apple Support (CA)

Excerpt from above link

Set up iCloud for Messages on your Mac

1. In the Messages app on your Mac, do one of the following:

• • macOS Ventura: Choose Messages > Settings, click iMessage, then select Enable Messages in iCloud.
  • macOS 12 or earlier: Choose Messages > Preferences, click iMessage, then select Enable Messages in iCloud.

1. Select which email addresses and phone numbers you want to send and receive messages from on your Mac.
2. Any messages currently stored in iCloud are now accessible on your Mac, and any new messages you receive on your Mac will be stored in iCloud.
3. Note: If you want to see SMS and MMS messages on your Mac, see the Apple Support article Forward SMS/MMS text messages from your iPhone to your Mac or iPad.
4. To see Messages stored in iCloud, open the Messages app.

Note: If you want to turn off Messages in iCloud on your Mac, deselect Enable Messages in iCloud. You can choose to disable Messages in iCloud for all your devices, or just your Mac.

Not in Monterey. The function was added in Ventura.