Hi Peter thanks for posting in the Lucidchart Community!
I don't completely understand the issue you are describing. When using the "Match Size" feature on my end the shape sizes match as expected:
Could you send screenshots of the issue you are experiencing so I can see what you're seeing? Thanks!
Hi - was the video not useful? Is there anything else I can give you?
Thanks for recording that video and apologies for the delayed response!
The match size feature will match the sizes of shapes but the shapes will remain in the same positions. If you wish to align the shapes you can do this by selecting them and then selecting "Align" in the context menu (right-click):