Is it possible to hide the "Right-Click to open in a new window or tab" button on a child table? I feel like I've done this in the past but I can't figure it out now...
All you need to hide those buttons is a bit of CSS.
div.formMaximize { display: none; }
If you want to apply this CSS to a specific table then you can add a CSS class in the table preferences and then use that CSS class as follows. In the example below we first added the class name 'hideMaximize' to the target table.
.hideMaximize .formMaximize { display: none; }
For instructions on where you can add that CSS see: Addiing custom CSS to dbFront