I realise Mac does not have Patch 7 yet, but preparing for users needing help when it does arrive for mac.

1. Delete your modsettings.lsx 

Mac: User/Documents/Larian Studios/Baldur's Gate 3/PlayerProfiles/Public Windows: %LocalAppdata%\Larian Studios\Baldur's Gate 3\PlayerProfiles\Public Linux: SteamLibrary/steamapps/compatdata/1086940/pfx/drive_c/users/steamuser/AppData/Local/Larian Studios/Baldur's Gate 3/PlayerProfiles/Public

2. Launch Baldurs Gate 3 Mod Manager / Vortex / or your mod manager of choice and check for updates. In BG3MM press F7 to bring up the update checker.

You can also use the in game mod manager (IGMM) as well.

For me I use both BG3MM and IGMM without issue, however I do advise where possible to mostly stick to one. You can download mod.io mods via their website page here: Baldur's Gate 3 - Mods or Baldur's Gate 3 Mods - mod.io

In fact if you like increasing your party size there is a mod I highly suggest: Adjustable Party Limit for Baldur's Gate 3 - mod.io as it also covers making sure you don't run into those pesty bugs we can get with party increase.

4. Go to your Mods folder:

Mac: User/Documents/Larian Studios/Baldur's Gate 3/Mods Windows: %LocalAppdata%\Larian Studios\Baldur's Gate 3\Mods Linux: SteamLibrary/steamapps/compatdata/1086940/pfx/drive_c/users/steamuser/AppData/Local/Larian Studios/Baldur's Gate 3/Mods

5. If you use mods such as ImprovedUI make sure to have the version for Patch 7 and remove all old Patch 6 versions of that mod from the above mods folder, as it states on the mod page.

6. remove Mod Fixer from your mods folder. It is no longer required in Patch 7.

7. You should be ready to launch your game.

A note that the game currently labels non mod.io mods with an alarming triangle icon with a ! in the centre. It is okay to press continue when the pop up shows up.

If using controller switch to keyboard and mouse, as there may be a bug not letting you press continue on controller.

This icon is just to inform you that some of the mods are from external sources, and to also give you a chance to remove the mods from your load order should you wish before continuing. 

Mod.io and external mods such as from nexus mods work fine together.

Some extra resources:

How to remove mods from BG3 | BG3 Modding Community Wiki