This knowledgebase article explains User on how to resolve the error "Startup Canvas Configuration Mismatch" appears when trying to deploy HMI runtime.
To resolve the above mentioned error, user needs to check the "Startup Canvas" setting in HMI Device Configuration settings under logical devices. User needs to check the name of the Canvas mentioned under Startup canvas and the given name is not matching with the available canvases. Therefore, the error appears when trying to deploy.
User has to rectify the name of the Canvas given in Startup Canvas setting and provide the correct available Canvas name. For example, in the above picture, "New_Overview" is the name given in the Startup canvas and if you see in Canvases, there is no canvas with name "New_Overview". Therefore, User has to rectify from "New_Overview" to "Overview" which is available in Canvases. After this HMI deployment will be successful without any issue.