1. Login to Admin
2. From the left menu Product > Categories  > [Select a category] > General Information (tab) > Include in Navigation Menu
3. Change it value to No

To check the current mode, go to the magento installed folder using terminal then use the below command bin/magento deploy:mode:show

[developer@user magento]$ bin/magento deploy:mode:show
Current application mode: default.

To change into developer mode, use the below command

[developer@user magento]$ bin/magento deploy:mode:set developer
Enabled developer mode.
[developer@user magento]$ bin/magento deploy:mode:show
Current application mode: developer.

1. Login to Admin Panel
2. Go to Stores > Configuration > Customers > Wish list > General Options
3. Change Enabled field value to Yes/No

1. Login into Admin Panel
2. Take the attribute listing from Store=>Attribute=>Product, then edit the attribute
3. On Edit page there is a tab Storefront Properties and in that make the Visible on Catalog Pages         on Front value to Yes