How to use flex to allocate elements in a row to maintain two elements

Issue

I want my elements to be in the middle of the screen and arranged vertically when on the mobile phone, but when switching to the tablet, the screen I hope to present is two elements in a row, presented from left to right!

Attached is the schematic diagram, but I'm stuck and don't know how to implement such a layout.

ul {
  display: flex;
  flex-direction: column;
  align-items: center;
}

@media (min-width: 768px) {
  ul {
    flex-direction: row;
  }
}

<ul>
  <li>title</li>
  <li>title</li>
  <li>title</li>
  <li>title</li>
  <li>title</li>
  <li>title</li>
  <li>title</li>
</ul>

Solution

Is this what you are looking for?

ul {
  display: flex;
  flex-direction: column;
  align-items: center;
}

@media (min-width: 768px) {
  ul {
    flex-direction: row;
    flex-wrap:wrap
  }
  li {
    min-width:50%
}

<ul>
  <li>title</li>
  <li>title</li>
  <li>title</li>
  <li>title</li>
  <li>title</li>
  <li>title</li>
  <li>title</li>
</ul>

Answered By - Erfan