Why is app designer not opening?

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Joshua Welsh
Joshua Welsh on 25 Nov 2016
Commented: Eric Delgado on 6 Aug 2021
I am unable to open app designer. I am running Mac OS Sierra with MATLAB 2016b. When I click on opening a new app designer script a MATLAB window icon appears in my dock, but a window does not appear.
Kajal Srivastava
Kajal Srivastava on 12 May 2020
I am having the same problem in R2018b on my windows device

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Accepted Answer

StephenJ on 16 Jan 2017
I was having the exact same problem (2016b, OS Sierra), which appeared when I had entered full-screen mode while connected to projector. In MATLAB click on new app designer script or open existing mlapp file, icon should appear in the dock. Then Menu->Enter full screen, app designer will show up, if not, swipe on your trackpad until designer window pops out, then reset it by closing MATLAB Window from the top menu. Worked in my case. Btw I tried changing the matlabpref.mat as suggested by Sean, it did not work itself, but there still might be a correlation with my solution as I didn't change the setting back.
Monika Jaskolka
Monika Jaskolka on 10 Mar 2021
I had this issue on Windows 10. This answer worked for me.
I hovered over the problematic window in the dock, right-clicked on it, and selected Maximize.

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More Answers (2)

Xulai Xu
Xulai Xu on 26 Nov 2016
Someone please answer this I encountered the same problem. Tried everything, nothing worked

Sean de Wolski
Sean de Wolski on 28 Nov 2016
What are the settings in
They should look something like this
ans =
struct with fields:
ShowIntroDialog: 0
Position: [1 1 112 0]
Maximized: 1
ShowCodeViewTips: 0
ShowCompatibilityDialog: 0
If not: Try, changing Maximized to true or Position to something like mine above, save back to matlabprefs.mat and restart MATLAB.
Eric Delgado
Eric Delgado on 6 Aug 2021
Different ways to handle this issue:
  • Update Windows 10 version
  • Update graphics driver

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