By default, Linked spaces feature is deactivated in all spaces.

To activate it:

1. Hover your mouse over the space name then click on Enable features.
2. Click on the on/off icon next to Add linked spaces (for multi-space events).

Prepare your spaces url then, in one of them:

1. Click on  Linked spaces in the bottom right hand corner.
2. Click on Modify, paste your space url and click on Save.

Prepare your url spaces list then, in one of them:

1. Click on  Linked spaces in the bottom right hand corner.
2. Click on Modify, add all of your spaces and click on Save.
3. Click on Copy spaces list, then Save.

Got to one of the spaces in the list:

1. Click again on  Linked spaces, then Modify.
2. Click on Paste spaces list, then Save.

Repeat the process as many as spaces you have in your list.

Click on  Linked spaces then select your space.