Sidebar collapses on clicking the kebab menu, for currently non-opened channel

Description:

On small size screen devices clicking on the kebab menu icon for channels other than the one which is opened collapses the sidebar, and the options float on the chat screen.

Steps to reproduce:

1. Resize the browser window to be less than 766 px width.
2. Now, the sidebar is collapsed by default.
3. Open any channel; let's call it the "present channel".
4. Open the sidebar by clicking on the hamburger icon in the top left corner.
5. Now click the kebab icon (the one with three dots) to open up the "present channel" options "Hide, Mark Unread,..."
6. Notice that the sidebar remains open.
7. Now, click the kebab menu icon for any other channel; the sidebar is collapsed.

Expected behavior:

The sidebar remains open.

Actual behavior:

The sidebar is collapsed, and the options float over the chat window.

Server Setup Information:

• Version of Rocket.Chat Server: 4.6
• Operating System: Windows
• Deployment Method: Open Server

Relevant logs:

Nothing logged on console.

Reproduce the issue on a window narrower than 766 px using the listed steps, then trace the frontend sidebar and channel kebab-menu behavior. Verify the behavior for both the open channel and another channel. Done means the sidebar remains open when opening options for any channel, with the options staying in the sidebar rather than floating over the chat.