How to pass argument from one canvas app to another canvas app in power apps

Write below code in button onselect method.

Launch("https://web.powerapps.com/apps/<yourAppGUID>?DataElement=" & Text(TextInput1.text))

yourAppGUID = Select your canvas app -> Details -> App id

In target App, get the value using Param function
Set(PassedDataElement,Param("DataElement"))