When your sidebar is set to right side, the scroll bar usually appears on the left side. To add the scroll bar to the right side of the sidebar you can achieve it by adding one line of CSS.

direction: ltr;

This will move the scroll bar to the right side

.sideBar {
z-index: 1000;
background: #273c75;
position: fixed;
top: 10px;
left: auto;
padding: 40px 30px;
box-shadow: 0 10px 20px #00000030;
border-radius: 10px;
max-height: 1000px;
width: 120px;
display: flex;
flex-direction: column;
transition: width 0.2s ease;
overflow-y: scroll;
overflow-x: hidden;
direction: ltr;

}