Hi,
Here's a basic example:
Take 5 maps in 5 separate map widgets, named map 1-5. These you want to link so the zoom extent is the same for all.
Map 1 could be your main map, say the primary one users interact with or land on first, though its not important.
Step 1. Add 4 'zoom to extent' triggers onto Map 1 pointing to maps 2,3,4 & 5
Step 3. Add 1 'zoom to extent' trigger onto Map 2 pointing to map 1
Step 4. Add 1 'zoom to extent' trigger onto Map 3 pointing to map 1
Step 5. Add 1 'zoom to extent' trigger onto Map 4 pointing to map 1
Step 6. Add 1 'zoom to extent' trigger onto Map 5 pointing to map 1
That's it...
Note though that if the map frame dimensions are different between any 2 of the map widgets you could still have issues.
Good luck
Andrew