RAX43 fast roaming

That router does not offer fast roaming, as it is not a mesh unit or dedicated AP.
if needed, you can check if a AP is using fast roaming 802.11r by using a mobile app like analiti for android to show which wifi roaming features are in use by an AP. https://play.google.com/store/apps/details?id=com.analiti.fastest.android

PS for the mesh units, Netgear will typically disable fast roaming by default on their mesh routers since some client devices will have issues with it (mainly obscure aliexpress style IOT products).

Here is an example of what you will see with the RAX43, as well as higher end models such as the RAXE500.

This is what you will see with the mesh units like the MK63 - MK93S and various other models. (fast roaming manually turned on in the advanced WiFi settings).