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Hello. The soil of my Chinese Elm stays damp for at least a week, sometimes longer.

I believe this is harmful for the tree. Should I repot it to a new soil? If yes, which one?

I repotted it to this soil, around April:

I am growing the tree in Scotland, but indoors. So temperatures remain 18-20C and rel. humidity remains at around 60%.

Well, at least you have given the information. Get it outside. where it belongs, If the soil is damp don't water, if the soils is draining well then it is fine. Are you sure though that it is not getting dry under the surface? Use a chopstick to see when it is dry.Push it in and if it comes out with soil on then no water.
There is a big difference between damp and wet.

Thank you for your quick reply @m5eaygeoff.

Sorry for poor word choice: I guess I should say "humid", "damp" or "moist" instead of "wet". The soil is not swimming in water; it just feels 'sticky' and looks darker than when it's dry.

I always use the chopstick method, but you make a good point by saying "if it comes out with soil on". Never watched for this variable; I have always only felt it with my fingers to assess humidity. So, are you saying that if the chopstick feels humid/moist/damp to the touch, but no soil comes out on it, then I should water?

I wish I could take it outside, but I live in a flat without a balcony or private garden.