Https://www.cnblogs.com/CodeGize/p/7859656.html
Unity-generated VS engineering is generally unable to open the Properties panel. But in fact, if you use vs for unity, you can open this property panel by configuring it. The unity version of 2017.2.0F3 is used here, with the VS for Unity 3.4.0.2 version and the IDE as the VS2017 version.
Open the VS2017, select Menu Tools, Options, and open the Options panel. In the Options panel, select the tool for unity (if not, use VS2017 installer to install the related components). Then, in Miscellaneous, set the Access Item property to True. OK, and restart vs. Note Be sure to restart VS will only take effect .
At this point, you can open the Properties panel.
Note, however, that for the settings on the Properties panel, all settings will revert to default if the code is changed and the project or solution is required to be re-loaded . Includes setting environment variables, setting XML exports, generating events, and so on. So this is not a good idea, but it's a bit of a function for a temporary build.
Open the Properties panel for VS Project in Unity Project