How to change lib-path for an RStudio project? - rstudio

Question

I set R_LIBS_USER to my desired library path in my system environment variables (I already moved my old library to that location). RStudio respects that path when I start the program without opening an existing file. But when I open RStudio by clicking on an .Rproj file, it loads an old lib path and ignores R_LIBS_USER (.libPaths() returns the old path). I searched my %UserProfile% directory and project directory for mentions of the old string. I can't find anything in %UserProfile% directory except in the history_database file, and likewise in the project directory, except for one mention in .Rproj-user\B37F6204\pcs\packages-pane.pper:
{
"installOptions" : {
"installDependencies" : true,
"installFromRepository" : true,
"libraryPath" : "<my-userprofile-path>/R/win-library/3.3"
}
}
This looked promising, but when I changed it, RStudio still ignores it when I open the project.
Clicking on .Rproj files is pretty convenient so I'd like to fix this.
RStudio version is 1.0.136
> sessionInfo()
R version 3.3.3 (2017-03-06)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1
locale:
[1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United States.1252 LC_MONETARY=English_United States.1252 LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] tools_3.3.3