How can I improve my display?

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frank din 2018-6-21

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https://ww2.mathworks.cn/matlabcentral/answers/406697-how-can-i-improve-my-display

I was trying to use simulink to run a live video. I connected the "from device" block to the "display" block, changed my output colorspace to grayscale and hit run. Instead of the video feed appearing, in the display block, a there was a matrix that was seemingly being created and at the bottom of the screen, there was a bar being filled and a variable T that was adding up to 1 and after both were done, the following error message appeared

Truncating signals shown by 'untitled/Display'. Displays can only show at most 200 elements of a vector or [20x10] elements of a matrix signal

How do I fix whatever's broken?