Solution to the problem that a Steam folder already exists on the selected hard drive

D:\Steam\steamapps\libraryfolders.vdf

"LibraryFolders"
{
    "TimeNextStatsReport"        "1622886485"
    "ContentStatsID"        "1329782524506893618"
    "1"        "F:\\SteamLibrary"
    "2"        "D:\\SteamLibrary" #新增的目录
}