explanation of buttons for "Transfor or discard changes" popup dialog #185 (#209)

Co-authored-by: Ian Bassi <ian.bassi@outlook.com>

general_settings/transfer_discard_changes.md

@@ -0,0 +1,18 @@
+# Transfer or Discard Changes popup dialog
+
+This window appears when switching away from a preset profile that has unsaved changes.
+There are options to discard, transfer, or save settings.
+These options apply to *preset profile* settings, separately from any settings saved in a project 3mf file.
+
+![transfer-discard-changes](https://github.com/OrcaSlicer/OrcaSlicer_WIKI/blob/main/images/GUI/transfer-discard-changes.png?raw=true)
+
+The options are:
+
+- **Discard**: Switch to the new profile, discarding any changes.
+- **Transfer**: All *New Value* settings will be applied into the new profile, but not saved as changes in that profile.
+- **Save**: All *New Value* settings are saved in the previous profile.
+
+A similar dialog pops up when you close OrcaSlicer with unsaved changes. In that case, the Discard and Save buttons have the same function, and there is no Transfer button.
+
+> [!NOTE]
+> None of these buttons save the current 3mf file; that must be done separately.

home.md

@@ -203,6 +203,7 @@ OrcaSlicer is a powerful open source slicer for FFF (FDM) 3D Printers. This wiki
 
 - [Import and Export](import_export)
 - [Keyboard Shortcuts](keyboard_shortcuts)
+- [Transfer or Discard Changes popup dialog](transfer_discard_changes)
 
 ## Developer Section