Different options in "modify"

[Anonymous]

Hi guys, I got a problem with the options in "modify", they are different and I don't know why netheir how to solve it. Can anyone help me? I need the option "combine" to create a mold but in this configuration, I don't have it.

[jeff_strater]

These are the Modify menus for different workspaces.  One is from the Sculpt workspace, the other is from the Model workspace.

Workspaces are selected with the Workspace pulldown: