1
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Let's blur the drawing only from 2 to 6 seconds.

2
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First, turn off Auto Blur.

3
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Under Manual Blur, choose Rectangle.

4
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Draw a rectangle around the whole drawing, with some margin.

5
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On the right, check that Rectangle 1 is set to Blur.

6
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Drag the left end of the purple bar to 2 seconds.

7
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Drag the right end to 6 seconds.

8
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At 4 seconds, the drawing is blurred.

9
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1 second is outside the range, so the drawing stays visible.

10
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7 seconds is outside the range, too.

11
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Check the edges, too. At 1.96 seconds it's still original.

12
00:00:51,600 --> 00:00:55,030
Blur starts at 2 seconds.

13
00:00:55,080 --> 00:00:58,560
Blur stays on through 6 seconds.

14
00:00:58,610 --> 00:01:03,290
From the next frame, 6.04 seconds, it's original again.

15
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Play from the start and check that only 2–6 seconds is blurred.

16
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When you're done, save the video with Export at the top right.