Imagine that in your report builder, you are using Form - Report Element, in its "record id", you set it to "#reportParam.recordID#".
The form will now load based on the this value.
Now, you will have Report Menu added in your UI Builder, let's call it "report123".
When you navigate to this menu "report123" in runtime, you can append this to the back.
report123?recordID=888
The form inside your report will now load the record with ID "888"
