Use Net Classes / Parameter Sets for specifying things likes controlled impedance
As it is now, things like 50R striplines are simply notes in the form of text objects.
It would be much better to declare net classes and assign them as directives to the concerned nets. This would automatically propagate them to the PCB layout step as well.
https://www.altium.com/documentation/altium-designer/sch-obj-parametersetparameter-set-ad