To search on the whole dashboard, you usually have a "Search" text bar :
You can type the searched value and a list of different categories containing the name appears and you
can choose which dimension you want from the list.
Note that * is used in the search to replace any number of characters. Ex : *doc* will return all data with doc in it. *doc will return any data that ends with doc.
Search in list
For some large lists, it's possible to search directly in the lists. Just click on the list, then start typing
In some list boxes you may also have a search icon :