after installing plugin "Lightweight Sidebar Manager" and configuration for it, I tried to make a new sidebar and this new sidebar should be in two language. then the language switcher in menu disappeared. then I tried to inactive this sidebar plugin, even deleted it. But the switcher doesn't come back.
Is there any documentation that you are following?
Please try the following steps after creating a full backup of the database and website:
1. Go to WPML > Languages > Menu language switcher
2. Resave the menu switcher settings
3. Go to WPML > Support > Troubleshooting page, then click the following:
- Clear the Cache in WPML
- Remove ghost entries from the translation tables