For better performance, consider hiding folders in the sidebar. This is a technical debt and I'm working hard to fix this. Sorry for the inconvenience.
To show or hide folders, check/uncheck View > Show Folders
Show or Hide Folders
Pinned Chats
To quickly access certain chats, you can pin them to the top section.
To pin a chat, right-click and choose "Pin Chat".
Pinned Chats show on top
Hidden Chats
Sometimes you want to declutter the sidebar but you don't want to archive the chats. You can choose to hide them instead.
You can always show hidden chats in the menu View > Hidden Chats.
Show Hidden Chats
Sort Chats
You can change this option easily in the menu View > Sort Chats By.
Starting from version 1.16.8, chats are sorted by edited date by default. Folders are always sorted by custom sort order (you can drag folders to reorder them)
Sort Chats in Sidebar
Compact Sidebar
For a more compact sidebar, select View > Compact Sidebar