XS_ENABLE_MIDDLE_BUTTON_DOUBLE_CLICK_ZOOM_ORIGINAL
Category in Advanced options dialog box
This advanced option must be set in an initialization (.ini) file.
When you set this advanced option to
TRUE
and double-click the middle mouse button,
Tekla Structures zooms the open drawing to its original size.
Example
XS_ENABLE_MIDDLE_BUTTON_DOUBLE_CLICK_ZOOM_ORIGINAL=TRUE