Users unable to see '+' icon and share icon in dashboards
The root cause is the 'responsive canvas for dashboards' is disabled in the entire instance.
We need to enable 'glide.cms.enable.responsive_grid_layout' system property on the instance. By default, it is set to false on upgrade instance and True for fresh instances.
Below are the steps
1. Navigate to sys_properties.list
2. Search for the property 'glide.cms.enable.responsive_grid_layout'
3. Make the 'Value' field to True
By changing the value to true sharing option will be visible.
Other than activating responsive dashboards, there is one way to share or add content on the dashboard for non-responsive dashboards
Please find the Service Now documentation below