When you create filters, they are specific to you, unless you specifically indicate that they are available to Everyone (See Create a filter). These filters are what appear when using filters in the All Devices view and other locations in N-able N-central.
If there are filters that you want other users or technicians to use, you can select those and distribute them.
Click Configuration > Filters.
Click the check boxes next to the filters to share.
Click Show in other users drop-down.
The filters will appear in the other users within the same Customer level when they use filters in their tasks.