I confim the issue in Ubuntu 16.04 LTS daniel-underwood13's solution worked for me
$ sudo nano /usr/bin/dia Change to #!/bin/sh # # Wrapped that calls dia in integrated version # LIBOVERLAY_SCROLLBAR=0 dia-normal --integrated "$@" -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1011446 Title: UML drawing tools' comment fields are too small to be usable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dia/+bug/1011446/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs