I can not. Drag widgets from here to a sidebar on the right to activate them

Try this first:

While in your widgets page, look in the Screen Options tab at the top of the page and see if accessibility mode has been accidentally enabled. If it says “Disable accessibility mode” in the drop down, click that and see if it restores your drag and drop.

If that doesn’t work you might try disabling plugins to see if there is a conflict of some sort.

ok. I delete multiple plugins, now it can work normally.

I’ve deactivated all plugins, still cannot move any widgets.
How to do Next?
Thanks

Can not get drop down of Screen Options. Same problem.

I still have this issue, any resolutions?

If any of you figure out what is the conflicting plugin, please let me know!

Deactivate plug-ins one-by-one, reloading the widgets page each time to find the problem.

In my case, the offending plug-in was “Subscribe to Comments Reloaded.”

Upgrading to version 2.02 of the plug-in resolved the probalo.