这是Grub的主题。具体路径在/boot/grub/themes/deepin/theme.txt

• boot_menu {
  left = 0%
  top = 0%
  width = 1000
  height = 200
  item_font = "Noto Sans CJK SC Regular 26"
  item_color = "#dddddd"

找到上边这部分，width调大一点就可以了，不过left应该也需要调一下才能保证居中

调整如下参数比较好看！

boot_menu {
left = 21%
top = 27%
width = 597
height = 351
item_font = "Noto Sans CJK SC Regular 12"
item_color = "#dddddd"
selected_item_color = "#ffffff"
item_height = 36
item_spacing = 8
item_padding = 8
icon_width = 26
icon_height = 18
item_icon_space = 15