The Add card / Add note from vault pop-up seems working on my end.
- macOS 14.6.1 / Obsidian v1.7.2
Can you try in the Sandbox vault to rule out any issues specific to that vault?
If it works as expected in the Sandbox or a new text vault, you can go through the troubleshooting steps here: About the Bug reports category - #11 by system to see if it’s a community plugin, theme, or CSS snippet causing the issue.