Seems I have only the option to move on y-axis. Moving the first repeat would not really look good (alignment frame border with barline below) can I cannot stretch in y-axis due to space limitations.
In this case, I’d suggest using the Note Spacing sub-mode of Engrave mode. Press the square for the first beat, then look for the circular handle (that only deals with upstem voice 1) here and alt-right to move it as you please. I seldom use that sub-mode but it could prove useful in this case. Or look up for some Engraving option for repeat markers spacings, I don’t remember what settings are available on the top of my head