unity3d - unity doesn't show preview -

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my question quite simple. learning unity , watching tutorial making 2d game.

in tutorial, there preview section @ bottom right corner. in unity, there nothing there. there inspector on right , below of add component there nothing.

can explain me how can activate part? in advance!

this want: enter image description here

this preview box resources. shows preview of resource. show must click on 1 of resources(like image).

preview box

however when not have resource selected not show

preview box not show when nothing selected


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