Hello,
How to make this spacer invisible or have the same color as background or is there any other way to devide this group?

Hello,
How to make this spacer invisible or have the same color as background or is there any other way to devide this group?

Well may be then something like this can be done.
But it is not something you can think as layout adjustment. You can't change the layout system of dashboard. (You can of course but it takes to know a little more what it takes to build it from scratch) You have to respect it.
[{"id":"c5e3a84d.461668","type":"ui_artlessgauge","z":"7a66351.6178ecc","group":"56c0ae85.413d3","order":5,"width":3,"height":3,"name":"","icon":"","label":"Gauge","unit":"","layout":"radial","decimals":"1","differential":false,"minmax":true,"colorTrack":"#555555","style":"","colorFromTheme":true,"property":"payload","secondary":"secondary","inline":false,"animate":true,"sectors":[{"val":0,"col":"#ff9900","t":"min","dot":0},{"val":10,"col":"#ff9900","t":"max","dot":0}],"lineWidth":3,"bgcolorFromTheme":true,"diffCenter":"","x":480,"y":320,"wires":[]},{"id":"2f8ecd30.58e262","type":"ui_artlessgauge","z":"7a66351.6178ecc","group":"56c0ae85.413d3","order":6,"width":3,"height":3,"name":"","icon":"","label":"Gauge","unit":"","layout":"radial","decimals":"1","differential":false,"minmax":true,"colorTrack":"#555555","style":"","colorFromTheme":true,"property":"payload","secondary":"secondary","inline":false,"animate":true,"sectors":[{"val":0,"col":"#ff9900","t":"min","dot":0},{"val":10,"col":"#ff9900","t":"max","dot":0}],"lineWidth":3,"bgcolorFromTheme":true,"diffCenter":"","x":480,"y":360,"wires":[]},{"id":"36d93b6c.ff0aa4","type":"random","z":"7a66351.6178ecc","name":"","low":1,"high":10,"inte":"true","property":"payload","x":320,"y":320,"wires":[["c5e3a84d.461668"]]},{"id":"d52ded99.1f01","type":"random","z":"7a66351.6178ecc","name":"","low":1,"high":10,"inte":"true","property":"payload","x":320,"y":360,"wires":[["2f8ecd30.58e262"]]},{"id":"986972f7.a3422","type":"inject","z":"7a66351.6178ecc","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"4","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":150,"y":340,"wires":[["36d93b6c.ff0aa4","d52ded99.1f01"]]},{"id":"90ecd37a.12be5","type":"ui_template","z":"7a66351.6178ecc","group":"56c0ae85.413d3","name":"dashboard CSS","order":6,"width":0,"height":0,"format":"<style id=\"dashboard-styles-override\">\n.nr-dashboard-cardcontainer {\n position: relative;\n background: transparent;\n}\n.nr-dashboard-theme ui-card-panel {\n background: transparent;\n border:none;\n}\n.nr-dashboard-theme ui-card-panel p.nr-dashboard-cardtitle {\n text-align:center;\n background:var(--nr-dashboard-groupBackgroundColor);\n}\n</style>","storeOutMessages":true,"fwdInMessages":true,"resendOnRefresh":true,"templateScope":"local","x":480,"y":260,"wires":[[]]},{"id":"56c0ae85.413d3","type":"ui_group","name":"Default","tab":"b935cb70.f94a78","order":1,"disp":true,"width":"6","collapse":false},{"id":"b935cb70.f94a78","type":"ui_tab","name":"Home","icon":"dashboard","disabled":false,"hidden":false}]