Just hit ESC on your keyboard and click one of the boxes.
Why did you choose this instead of the renpy standard of Right click the mouse?
Edit: Also, it's "Hit esc twice" hitting it once brings up the task list, hitting it again once the task menu was up brought up the save menu.
edit edit: that may have been a bug, maybe because I tried to bring up the save menu when choices were on screen. I hit esc after that to load the save on a clean screen and it came up on the first hit. however I loaded into my room and not at the location that I saved at.
continued experimentation with saving shows some weirdness; saved at a choice (Tell kim that you'll return her photos or keep them), loaded the save, had the keykard & locker keys placed in my inventory and was outside of the conversation. Was able to interact with kim and restart the conversation. (This resulted in me having two sets of those items)
Are you doing something weird with the way you save to try to stop people from save scumming choices?
Also, pressing H or clicking the middle mouse button to hide the ui/text boxes s disabled