Hi
I’m facing the same problem with elementor 2.6.7, elementor pro 2.6.2, polylang 2.6.2 and polylang connect 1.0.0. I had to unplug the 2 polylang plugins to edit with elementor.
DesActivating and Activating is a workaround that works for a website under development. If the website is online, it’s not possible.
Regards