The Dataset that you select determines which resources and activities will show up in the dispatch console, you can set this up in the Scheduling Dataset screen.

If you turn on Manual Scheduling, all resources defined under the site connected to the dataset will appear in the dispatch console, if you don’t turn on Manual Scheduling only the Scheduling Resources will show up. 

The below pages should give a bit more info.

https://docs.ifs.com/ifsclouddocs/22r2/WorkProcessing/AboutDispatchConsole.htm

https://docs.ifs.com/ifsclouddocs/22r2/WorkProcessing/ActivityDispatchConsoleSearch.htm

For clarity to others reading this Alliance group forum, the question was in regards to IFS PSO dispatch console, not the Alliance dispatch console