How to make Select Tool mode default instead of Hand Tool in PDF-XChange Viewer?

In the menu click on "Edit" ==> "Preferences", in the "Categories" choose "Tools", for the "Default Tool" option, choose "Select Text" from the drop down list.

PDF-XChange Viewer is free but discontinued. It does not have the option to set the Select Text tool as the default tool.

It has been superseded by PDF-XChange Editor, which is a freemium product, described as:

More than 60% of the features in PDF-XChange Editor do not require a license to use. The remaining features, which are clearly identified, will place a 'trial' watermark on output if they are used without a license.

The PDF-XChange Editor does contain the option you require in menu File > Preferences > Tools:

I suggest therefore using PDF-XChange Editor, rather than the Viewer. Viewing and the Select Text tool will still be available in the Editor, including the Preferences change that you demand.