How do I remove the text below the chart?
First by working out why it is there.
Show us how you have configured the chart node.
Also add a Debug node showing what is going into the chart, and show us what is there.
At a guess send an empty label a payload and a series message properties, with no msg.topic
e.g.
[{"id":"cd610c935e3473b8","type":"inject","z":"b9860b4b9de8c8da","name":"","props":[{"p":"payload"},{"p":"msg.label","v":"","vt":"str"},{"p":"series","v":"test","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"3","payloadType":"num","x":110,"y":3300,"wires":[["99c2e1533ad310d5"]]},{"id":"99c2e1533ad310d5","type":"ui_chart","z":"b9860b4b9de8c8da","name":"","group":"2d4fe667.28f8ba","order":2,"width":"9","height":"6","label":"chart","chartType":"bar","legend":"false","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"0","ymax":"20","removeOlder":1,"removeOlderPoints":"","removeOlderUnit":"3600","cutout":0,"useOneColor":true,"useUTC":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"outputs":1,"useDifferentColor":false,"className":"","x":310,"y":3360,"wires":[["66f3a8506ea55dae"]]},{"id":"66f3a8506ea55dae","type":"debug","z":"b9860b4b9de8c8da","name":"debug 323","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":490,"y":3340,"wires":[]},{"id":"2d4fe667.28f8ba","type":"ui_group","name":"demo","tab":"1caa8458.b17814","order":2,"disp":true,"width":"18","collapse":false,"className":""},{"id":"1caa8458.b17814","type":"ui_tab","name":"Demo","icon":"dashboard","order":2,"disabled":false,"hidden":false}]
But really not enough info given to answer your question.
e.g.
no payloads , what node you are using and how you have configured it, and finally is it live readings or stored.
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