On calling an HTML Export or Outline Export or Export of Selected Note (via the File menu) a OS-style folder selection dialog is shown - select an existing folder or create a new one. The selected folder is the location to which export will occur. This location is remembered in the TBX so it should not normally be required to reset it after first use unless deliberately choosing a new location.
Depending on the size and complexity of your TBX, there may appear to be some delay before the dialog opens. This is because before doing a full HTML export, all agents are updated to ensure output is correct, especially where automatic updating of agents is turned off.
Once HTML export starts a progress bar appears above the main view showing the progress of the export process.
Outline export. Outline export results in a single plain text file with the title of each note in the document indented one tab stop per outline depth level. Thus root level notes are not indented, their children are indented one tab, etc. See more on Outline Export.
Selected Note(s). The selected items are exported to the same folder - regardless of hierarchy location. Do not use this option for re-exporting a single note to its location within a whole document export context.