Can't move point in sketch
There are 2 coincidenal points here. One on the end of the line you want, and one that joins the projected arch to the pojected line. You need to delete the correct one, and click on the correct one.
If it was me modelling this, I certainly wouldn't have projected the entire face as there is load of geometry that isn't required. And, I wouldn't model it "wrong" to then correct it, You can get all the geometry you need from projecting two points.
Also, I have no idea why people don't use part of the origin as there middle point on parts that are going to be symmetrical....You can model most of this part in one half and then mirror it....
Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?
Attached is an alternative technique.
Ah, even though the tutorial is not great, you have some rookie mistakes too.
The fillets work if done as 2 steps, do the 2 vertical edges first to make the rounding. (1mm). (Not sure why he did not have the 2 point circle both ends - it works both ways.)
After that Select the top face (as second fillet command) will fillet at 1mm. In the video that only just turned up, you did not select the edges at the top end, might make a difference.
To stop the pattern failing, start the pattern, change the type to Features,
from the timeline, select the Emboss and 2 fillet icons off the timeline. Set the pattern values, works for me.
Blue and white Sketch article should keep you awake at night. (All sketch articles should be black or purple.)
You have a few duplicate flange bodies, 2, 3 and 4. Can be deleted.
I'll presume the Whisperer has done his normal best quality, so not going to provide a "my way" version.
Might help...
