How to close the small blue window appeared in the command window

Does anyone experience this, where a small blue window appears in the command window and cannot be closed?

[Walter Roberson]

Which Linux release are you using, and which MATLAB version?

[Chaoyang Jiang]

matlab2017b and linux 2.6.32-696.16.1.el6.x86_64

[Walter Roberson]

That appears to be either Centos or Red Hat Enterprise Linux 6 ?

Answer 1

[Ameer Hamza]

Turn off the function hints from MATLAB Preferences. Run

preferences

Navigate to MATLAB > Keyboard, uncheck Enable function hints. If you want them to appear manually, press Ctrl + F1.

Answer 2

[Walter Roberson]

Historically this problem has been connected to using Unity on Linux.

https://www.mathworks.com/matlabcentral/answers/178241-why-are-all-the-warning-boxes-blank

https://www.mathworks.com/support/bugreports/1229653

The information there is about empty pop-ups, but the problem with pop-ups not being closable was related if I recall properly.

There have also sometime been really messy displays on Linux due to Java issues; https://www.mathworks.com/matlabcentral/answers/296491-problems-with-matlab-windows-both-editor-and-command-line-windows-when-using-r2016a-on-ubuntu-16-0