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Why is app designer not opening?

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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.


Jacopo Elia
Jacopo Elia on 29 Mar 2018
Elliot Wolf solution worked for me! Thank you!
Muhammad Asif
Muhammad Asif on 20 Apr 2020
Unfortunatly Elliot Wolf solution doesn't work for me
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.


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Neil on 26 Jan 2017
Had the problem with 2016b and El Capitan. This worked.
Oleg Komarov
Oleg Komarov on 8 Aug 2017
Had problem on Mac OS Sierra and R2016b. This fixes.
Grace Enamorado
Grace Enamorado on 18 Apr 2019
Where do you find "menu -> Enter full screen"

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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


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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.


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Joshua Welsh
Joshua Welsh on 3 Dec 2016
Sean, I altered my position and maximized settings as you per your example, I was still unable to open App Designer.
George A.
George A. on 2 Apr 2017
The correct answer, at least what worked for me, is a combination of Sean's and StephenJ's answer.
First, do what StephenJ says and get the correct Position from the Preferences.appdesigner struct. Then, use this position in the old matlab's prefdir.
The Position=[1 1 112 0] didn't work for me.
David Mellinger
David Mellinger on 17 Apr 2020
I can't get appdesigner to start at all. I type 'appdesigner' and nothing at all happens -- I just get another command prompt. No windows appear, neither maximized nor minimized. Same when I choose Home->New->App in the ribbon (perhaps this is just like typing appdesigner). I'm using R2019b in Win10 Pro.
I tried Elliot's solution -- moving C:\Users\<myname>\AppData\Roaming\MathWorks\MATLAB\R2019b to R2019b_old, re-creating the directory, and restarting -- but that didn't change anything. If I try
cd(prefdir); load('matlabprefs.mat'); Preferences.appdesigner
then I just get an error, "Reference to non-existent field 'appdesigner'." My Preferences struct has only one field, MATLABZoom, perhaps because I've never successfully started appdesigner.

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