have you tried my mapping??? https://forums.pioneerdj.com/hc/en-us/community/posts/206520696-XDJ-RX-FW2-10-Traktor-Pro-2-10-1- see if this might work for you ;)
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xdj-rx traktor pro jump folder
Hello I have xdj-rx and I do not know how to switch between folders when controlling the traktor pro
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how to switch between folders ?
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see the picture of my mapping and use 44 knob to move up/down in browser tree and 7 button to expand/collapse browser tree 
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okej thank you
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