I tried the following:
[{"id":"8f1e9a5e.0b27d8","type":"ui_dropdown","z":"85a0b8d9.6add58","name":"","label":"","place":"Select option","group":"b44d8a41.4ba8a8","order":0,"width":0,"height":0,"passthru":false,"options":[{"label":"Amy","value":1,"type":"num"},{"label":"Bob","value":2,"type":"num"}],"payload":"","topic":"","x":460,"y":60,"wires":[[]]},{"id":"fd1982c3.b54f1","type":"ui_switch","z":"85a0b8d9.6add58","name":"","label":"switch","group":"b44d8a41.4ba8a8","order":0,"width":0,"height":0,"passthru":false,"decouple":"false","topic":"","style":"","onvalue":"true","onvalueType":"bool","onicon":"","oncolor":"","offvalue":"false","offvalueType":"bool","officon":"","offcolor":"","x":450,"y":120,"wires":[[]]},{"id":"d3af1ed2.88646","type":"ui_slider","z":"85a0b8d9.6add58","name":"","label":"slider","group":"b44d8a41.4ba8a8","order":0,"width":0,"height":0,"passthru":false,"topic":"","min":0,"max":10,"step":1,"x":450,"y":180,"wires":[[]]},{"id":"f96b24d.6b9b9d8","type":"ui_numeric","z":"85a0b8d9.6add58","name":"","label":"numeric","group":"b44d8a41.4ba8a8","order":0,"width":0,"height":0,"passthru":false,"topic":"","format":"{{value}}","min":0,"max":10,"step":1,"x":460,"y":240,"wires":[[]]},{"id":"c9945030.42ae2","type":"ui_text_input","z":"85a0b8d9.6add58","name":"","label":"","group":"b44d8a41.4ba8a8","order":0,"width":0,"height":0,"passthru":false,"mode":"text","delay":300,"topic":"","x":460,"y":300,"wires":[[]]},{"id":"9759df3e.f4c2f","type":"ui_date_picker","z":"85a0b8d9.6add58","name":"","label":"date","group":"b44d8a41.4ba8a8","order":0,"width":0,"height":0,"passthru":false,"topic":"","x":450,"y":360,"wires":[[]]},{"id":"212555b2.082b3a","type":"ui_colour_picker","z":"85a0b8d9.6add58","name":"","label":"","group":"b44d8a41.4ba8a8","format":"hex","outformat":"string","showSwatch":true,"showPicker":false,"showValue":false,"showHue":false,"showAlpha":false,"showLightness":true,"dynOutput":"false","order":0,"width":0,"height":0,"passthru":false,"topic":"","x":470,"y":420,"wires":[[]]},{"id":"60b44173.def3c","type":"change","z":"85a0b8d9.6add58","name":"set","rules":[{"t":"set","p":"payload","pt":"msg","to":"","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":90,"y":240,"wires":[["11a3bb54.53c8a5"]]},{"id":"11a3bb54.53c8a5","type":"ui_button","z":"85a0b8d9.6add58","name":"clear-button","group":"b44d8a41.4ba8a8","order":0,"width":0,"height":0,"passthru":false,"label":"Clear","color":"","bgcolor":"","icon":"","payload":"[]","payloadType":"json","topic":"","x":250,"y":240,"wires":[["8f1e9a5e.0b27d8","fd1982c3.b54f1","d3af1ed2.88646","f96b24d.6b9b9d8","c9945030.42ae2","9759df3e.f4c2f","212555b2.082b3a"]]},{"id":"b44d8a41.4ba8a8","type":"ui_group","z":"","name":"Group 1","tab":"491c9b78.645584","order":1,"disp":false,"width":"6","collapse":false},{"id":"491c9b78.645584","type":"ui_tab","z":"","name":"I4Inari - Clear Inputs","icon":"dashboard","order":4}]
It seems that text input, slider, numeric, date and color changed to default once I click the Clear button. But, the switch never change to off state back. How to make that the switch back to off once I click on the Clear button? The following is the information of the switch: