first ending format - more than 1 bar

right-click, line properties, disable hook, or just select it and in Inspector change from closed to open

right click-> Line properties uncheck hook

The line properties (right click the volta do not select volta properties) has a hook option that shows the vertical lines.

Actually; what you really want to do is: extend the first-ending to the repeat-barline :||

If first ending is already present:
1. Double-click on the first-ending,
2. select the rightmost box (which should already be selected)

3. and use shift + right arrow keys to move forward (each keystroke advances a measure.). // A red vertical line indicates which measure you are on.

or (delete the first-ending, and) :
Select the required measures up to the repeat-barline and double-click the first-ending symbol from the palette.

Notice: The open-end is usually used for the very last ending.