Hi,
Do you run pdlegacyshell16.exe or pdshell16.exe ?
If you want see Toolbox at your right you must run pdshell16.exe
Here usual display of Tools=>Customize Menu and Tools if you run pdshell16.exe
and your Toolbox is at right of your screen
If you run pdlegacyshell16.exe - No Toolbox is available at right of your screen and you have fewer options to Customize Menu and Tools.
If you run pdshell16.exe and Toolbox is not displayed. You can show Toolbox if you select Toolbox under View Menu