This has been going around since 2020.
We are using the new modal, in v3.52 on prem, but it's still possible for a user to interact with components that are displaying in the background when the modal is open.
all components that are on display whenever the modal is open (showing) should be disabled from any user interaction.
Currently the hack to get around this is to plug in a load of js to disable each component
This really should be a built-in feature from within the modal function
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Hi @peter.b Is your team using the Show overlay option? I believe this should solve it 
Otherwise, I'd recommend using close when clicking outside
Hi Tess
Yes we have show overlay checked
Still can click behind the modal
The only way we can stop this happening is if we choose a full screen modal
Thanks for letting us know 
Could you share how you're testing this? (i.e. which components are you able to interact with, and which browser)?