okay, first of all, I think that there is a big change between ST6 what Tushar is showing and ST8 what we use.
The standard behaviour of Solid Edge using distance dimension between 2 points doesn't work proper when using edges instead of 2D sketch lines.
At least here with ST8
So the only solution I can give is, that You use the method "dimensions axis" instead (what is seen in Your video already) but You have to define the dimension axis using the small icon on the left of the toolbar, selecting You reference axis
Then it work as it should, but I think the 2 ponits method must be adapted to be in the same way as in 2D sketches.
Here is the video:
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