Right-clicking to perform any function is not a feature of Manager. You did not say what edition of Manager you are using (desktop, server, or cloud). Nor, if using server or cloud, did you say what browser. And you have not specified your operating system.
Right-clicking to see a print preview may be a feature of your operating system or browser, but you should not expect any result from Manager.
If you want to print directly from a Manager view screen, click the Print button. Once you do that, you are using your operating system’s printer driver(s). Only the PDF button does anything that is under Manager’s control.
You also need to clarify just what you mean by “text is missing from my invoice when printed.” Do numbers print? Does a logo print? Does anything happen at all?