Many of project assemblies has xml document files, which msbuild includes in the deployment build and copy them into bin folder. To exclude these files:

1. Unload project

2. Open project file for editing

3. Add next lines in the PropertyGroup section of each environment you want to exclude *.xml files

<!-- Prevent default XML and PDB files copied to output in RELEASE. Only *.allowedextension files will be included, which doesn't exist in my case. -->

In the example these lines added into the Debug and Release builds:

4. Reload and rebuild project.