What material are you trying to adjust? How the benefits/impacts of recycling that material are allocated is probably the reason why there is no change when you adjust the recycling content. Please refer to this post for more information.
I think with modelling recycled content in a material, it’s better to use a material swap instead of manually adding a recycled content % to it. Mainly because that manual adjustment may not be a good estimate of the impacts associated with the recycling process involved for that material. Swapping the material out with the recycled version of that material however is coming from the LCI dataset which is based on industry averages therefore more legit.