You can change the location in resources. Parameters used to define the value of some variables to be able to use in different places in the template resources. Resources are used only for complicated expressions. In any case, RM will only deploy from resources. In case the value is not mentioned directly, then it will check parameters if it is specified in the resources. Based on this question, the value of location is defined directly in resources. so you change the resources location value.
Use location parameter. To allow flexibility when deploying your template, use a parameter to specify the location for resources. Set the default value of the parameter to resourceGroup().location.
Reference:
https://docs.microsoft.com/en-us/azure/azure-resource-manager/templates/resource-location?tabs=azure-powershell
https://docs.microsoft.com/en-us/azure/azure-resource-manager/templates/template-syntax#resources