A guide system for guiding a movably-supported first furniture part, in particular a first door wing of a folding door, hingedly connected to at least one second furniture part, in particular a second door wing of a folding door, comprising: - a first guide rail for guiding the furniture parts (3a, 3b), - a second guide rail for guiding the furniture parts (3a, 3b), the second guide rail extending transversely relative to the first guide rail in a mounted position, - a guiding device to be connected to one of the furniture parts (3a, 3b), the guiding device being movable relative to the first and second guide rail (9, 13a) and configured to be transferred in a crossing region, seen in a top view onto the first and second guide rails (9, 13a) in the mounted position, between the first and second guide rail (9, 13a), - wherein the guide system includes a drive device having an entrainment member which is acted upon by at least one force storage member, the entrainment member being configured to be releasably coupled to the guiding device, wherein the entrainment member is locked in a parking position and wherein the entrainment member can be unlocked by an entry of the guiding device into the crossing region such that the entrainment member, jointly with the guiding device coupled therewith, can be retracted at least over a region along the second guide rail by a force of the at least one force storage member, characterized in that - at least one pressure roller is rotatably supported on the entrainment member, the pressure roller being configured to be pressurized against a control curve by the force of the at least one force storage member, wherein the pressure roller is configured to run in or along the control curve upon a movement of the guiding device along the second guide rail, - the control curve includes a retraction section by which the entrainment member can be retracted along the second guide rail by the force of the at least one force storage member in a retraction direction, and a tensioning section adjoining the retraction section and by which the at least one force storage member can be loaded upon a continued movement of the entrainment member in the retraction direction, - a switch member with a setting contour formed or arranged on the switch member is provided, wherein the pressure roller is configured to run along the setting contour of the switch member upon a movement of the entrainment member in a direction opposite the retraction direction so as to bypass the retraction section of the control curve. - a first guide rail for guiding the furniture parts (3a, 3b), - a second guide rail for guiding the furniture parts (3a, 3b), the second guide rail extending transversely relative to the first guide rail in a mounted position, - a guiding device to be connected to one of the furniture parts (3a, 3b), the guiding device being movable relative to the first and second guide rail (9, 13a) and configured to be transferred in a crossing region, seen in a top view onto the first and second guide rails (9, 13a) in the mounted position, between the first and second guide rail (9, 13a), - wherein the guide system includes a drive device having an entrainment member which is acted upon by at least one force storage member, the entrainment member being configured to be releasably coupled to the guiding device, wherein the entrainment member is locked in a parking position and wherein the entrainment member can be unlocked by an entry of the guiding device into the crossing region such that the entrainment member, jointly with the guiding device coupled therewith, can be retracted at least over a region along the second guide rail by a force of the at least one force storage member, - at least one pressure roller is rotatably supported on the entrainment member, the pressure roller being configured to be pressurized against a control curve by the force of the at least one force storage member, wherein the pressure roller is configured to run in or along the control curve upon a movement of the guiding device along the second guide rail, - the control curve includes a retraction section by which the entrainment member can be retracted along the second guide rail by the force of the at least one force storage member in a retraction direction, and a tensioning section adjoining the retraction section and by which the at least one force storage member can be loaded upon a continued movement of the entrainment member in the retraction direction, - a switch member with a setting contour formed or arranged on the switch member is provided, wherein the pressure roller is configured to run along the setting contour of the switch member upon a movement of the entrainment member in a direction opposite the retraction direction so as to bypass the retraction section of the control curve.