ac4ce26d_1_0_Help____Editor__Appearance__Item
[Description] Select this check box to have the block caret applied in the Insert mode and the usual caret applied in the Overwrite mode. Clear this check box to have the usual caret applied in the Insert mode and the block caret applied in the Overwrite mode. [Item] 
Use block caret
IntelliJ IDEA 14.1.0 Help :: Editor. Appearance