Hey,
I miss the feature of autocompletion in Anyrail. I have sometimes Gaps in my plans nad want to close them. I found solution which will work but die tracks are not connected in Anyrail and i do not know how to close them properly

In many situations, autocompletion is problematic with sectional track. With flex track, it's usually trivial.

Most of the time it is not possible to find a combination of short filler straights and curves to make it work, or it will result in a very curved solution.
Also, it is usually easy to move the gap around by disconnecting and reconnecting stretches of track. Often, this will lead to a much easier gap to span.

In many example track plans using sectional track, the manufacturer uses the natural play (or wiggle room) in the track to make it fit. A connection that's only 1 degree off will sometimes result in a very acceptable solution to close a gap further down that stretch.

More on using the play in the track is here:

https://www.anyrail.com/AR6Docs/en/closinggaps/

Is there a way to measure a gap?  I tried to find it but I couldn't find it by going over the menu's. I would like to know 3 things about the gap.
 1. If it is straight, just the distance left between them.
 2. If the alignment is off, the offset between the tracks. Distance between 2 parallel tracks might be useful to for building a station.
 3. if the 2 pieces are not somehow parallel, i would like to know the difference.

I don't know if any of the features are allready present and I just missed them.

I think the idea of being able to measure gaps is quite good.
Especially when you combine track material from different manufacturers, it is easier to find the right piece for the gap. VG

Measuring gaps goes like this:

Select one of the endpoints. It turns green.

Hover over the other endpoint. The distance is displayed on the status bar. Following the distance, there may be one or two letters following the distance:
A: Aligned (the two endpoints line up and the gap can be closed with straight track)
O: Opposite (the two endpoints have opposite angles)


Example:
10 (A, O)
Distance: 10 (units depend on measurement settings)
Endpoints are aligned and opposite, so you need a straight of length 10