@FlachyJoe please check here, I have added arc helpers for radius constraints. This would be the best for arc - something distances (#9166)
I can make this when your PR and this PR merges. Or add on top of this one if your PR merge first.

This is quite interesting. Seems like an improvement based off what I see in the screenshots.

@wwmayer this is touching SoDatumLabel which you know so perhaps you would be willing to review this PR please ?

The changes in SoDatumLabel are OK.

@adrianinsaval care to check this one out? Werner already reviewed changes in SoDatumLabel

This would be the best for arc - something distances

Certainly yes ! But in fact arc helper is needed for all the constraints, see floating icons for tangencies in #9166 (comment)

Do those floating icons actually happen in real life work ? I am not sure there are so many tangencies to arcs in random positions that would end up floating.
If it does happen and is a real issue, then a possibility would be to draw arc helpers for geometric constraints when needed as well. But this may be much more work as geometric constraints do not have soDatumLabels (afaik).

@PaddleStroke we understand the left tangent only with the right part of the sketch

I see.
But in these cases, do you think the user is going to toggle arc helpers ? It's likely that if you don't understand the sketch you will select associated geometries instead. I'm not sure the arc helpers would help much to understand in the sketch you screenshoted.

But yes arc helpers similar to the one I made for radius in this PR would probably help I guess as you would have only a red line between the arc and the contraint.

@PaddleStroke did something mess with this? It is currently not working in the latest weekly build:

Maybe #11777 or related to: #11826

OS: Windows 11 build 22631
Word size of FreeCAD: 64-bit
Version: 0.22.0dev.35449 (Git)
Build type: Release
Branch: main
Hash: f3fa2ba9c9b1999e5c32d3ae544481b6e17553bb
Python 3.10.13, Qt 5.15.8, Coin 4.0.2, Vtk 9.2.6, OCC 7.6.3
Locale: German/Germany (de_DE)
Installed mods: 
  * 3DfindIT 1.2.0
  * BIM 2021.12.0
  * CfdOF 1.24.9
  * CurvedShapes 1.0.5
  * Curves 0.6.19
  * Defeaturing 1.2.1
  * fasteners 0.4.75
  * FEMbyGEN 2.0.0
  * freecad.gears 1.0.0
  * freecad_metal_workbench 0.0.1
  * OpenDark 2023.12.17
  * sheetmetal 0.3.13
  * woodworking 0.21.1.33694

@maxwxyz hmm maybe someone reverted these changes when trying to fix #11777 ?
Or perhaps it was broken by #9166 @FlachyJoe any idea about this?

@FlachyJoe it is still present, shall I create an issue?

@maxwxyz Not sure why but 2 commits were lost.