When using WiFi manager in RemoteXY projects there is some important things to do. Here is earlier example:
http://forum.remotexy.com/viewtopic.php?pid=2514#p2514
Now, normal library RemoteXY.h will be replaced with remotexy_custom.h and it is not in update list at all.
There is also function RemoteXY_sendInputVariables() and thats why it is still needed, I think.
So, it would be a really good thing if the features required by the wifi manager were included in the normal library.
Also in addition, instructions on how to use wifi manager should be on the "help" pages.

Again, just guessing what your older code looks like... but as I understand it by reading other topics, all one should need to do is remove the RemoteXY_sendInputVariables() command and the rest should work as now intended.

As for the Edit Field element... in the editor, set input type: as Float

https://remotexy.com/en/help/controls/edit/

2nd question was how to add decimal point to field. I accidently erased this question, I was stupid. Sorry.

Now I wonder where the version changes of the libraries can be found chronologically?

My early projects using this external function needed it.
Edited field did not update without it.

Without seeing your code this is a guess of what you are doing, but I suspect that RemoteXY_sendInputVariables() is a depreciated function now... possibly since 3.1.x?

Sending data back to elements in the GUI is now as simple as...

RemoteXY.<ELEMENT_NAME> = <VALUE>;

Or for a text element

dtostrf(<VALUE>, 0, 0, RemoteXY.<ELEMENT_NAME>);

See... https://remotexy.com/en/help/indications/