I have recently upgraded from Vegas Pro 18 to 21, and it appears that you can enable or disable the Event Headers in the "..." button next to the "fx" button per each event (formerly the "hamburger" button I believe). I think the default is now that the Event Headers are off, and with that being the case, the "fx" and whatever other buttons are selected for your Visible Button Set will then appear at the lower right corner of each Event. Enabling the Header moves them to the top right of the Event, but it also leaves less room on the Event to display a waveform or video preview image. However, I am quite used to those buttons in the upper right corner, so I keep clicking them by accident.
In short, I'm wondering if there is a way to set it so that the buttons will appear in the upper right rather than lower right corner of the Event while the Event Header is disabled. It's a minor issue, but I like the space allowed without the header and would prefer to have the best of both worlds if possible.