fyi
The new forums have two login points - top-right of screen and in the menu bar below the wattOS logo.
I am consistently unable to login using the top-right boxes.  Have tried with time period changed - no difference.  Each time I am redirected to a "wrong password" screen, which then accepts the username/password combination.
Using the menu bar facility works every time.

Cause ?   I do use Ghostery in Firefox ... perhaps that's the cause.

Welcome to wattOS.

You might need to clarify your question to get a useful answer from someone who knows.
Do you want to change only the DE of microwatt to LXDE and keep all the apps, etc the same, so it would still be microwatt (sort of) OR do you want to move from microwatt to R8-LXDE without losing work you've done ?

I expect someone will be able to give you a lead on your change.

piCore  (aka tinycore-rpi  aka TinyPi)