By default, in the upper part of the Collationer Perspective collation and equivalence sets are shown. If such sets are not selected, the upper part is empty. If you want to create a collation set, you can click on on the toolbar to open the collation set list and drag and drop TextGrid Objects from the Navigator or Search Results View into the list. The collation set is the set of all text witnesses the collation should take into account. The texts must be given as plain text (.txt). To create an equivalence set, click on on the toolbar to open the equivalence set list and drag and drop tokens from the Collation Result Component into the list. The equivalence set defines all items that should be treated as identical. Variance between them will be ignored by the tool.