In the resource view you have the option to manually switch employees and devices to invisible.
Activate in the menu Construction site manager the entry Select. The table with all employees and devices opens on the left. In the column visibility Your resources that have already been created and visible in the construction site manager will be marked with the symbol Sunshine displayed. By clicking on the Sunshine click it becomes snowflake and your resource invisible. Another click on the snowflake shows the resource and its stakes again.
You can also hide several resources in one step. Mark with in the table Ctrl or Shift multiple resources and then click the icon Sunshine.