With the "Search in all catalogs & classifications " option, you will not miss any possible hits, but you will have less of an overview.
With the option "Search in current selection " you may save yourself the trouble of filtering afterwards.
- Current selection is useful if you only want to search in a specific directory of a catalog or a specific catalog. - The value under Search in [Search in] changes analogously to the selected directory/catalog in the index tree. If you remain within a directory or catalog during index browsing, there is no change under Search in. This means that the search always takes place in the directory/catalog that is currently selected in the index tree. Only when you change the directory or catalog during index browsing is the new selection set under Search in [Search in]. - You can also select several directories or catalogs in the index tree. Multiple selection with the Ctrl key. 
- Fixed selection is useful, for example, if the search part in a geometric search is in a different catalog than the parts to be searched or if you already know that you will be searching this directory or catalog more often in the near future. - When you select a list field, it is fixed to the directory or catalog selected at that moment. - The display under Search in remains unchanged if you change the selection in the index tree. Only a new selection in the list field changes or removes the fixation. 
- In Custom selection. [Custom selection...]. - It is possible to create your own search templates so that they are immediately available again at a later date. For example, you can create a search template where only certain preferred catalogs are searched. - You can also define a standard selection [Default selection] that is automatically displayed in the list field under Search in when you start PARTdataManager is automatically displayed in the list field under Search in. - See Section 3.1.6.2, “ Custom selection... ” in ENTERPRISE 3Dfindit (Professional) - User 

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