But, the Smart Folder is only available 'behind' the accounts expander.
I would prefer to see the Smart Folder always directly above the folder list.
See what you mean but:
- Switching between folders of same account is "near distance"
- Switching from one account to another is "far distance"
- Switching from account to smart folder is more similar to going to another account ("far") than to another folder ("near")
- Finally, if we put smart folder at same level as real folders - going "account to smart folder" and "smart folder to account" would work differently
Perhaps you'd like the whole top panel (with accounts and smart folder) to be "always" expanded?
If so, app settings -> look and feel -> accounts panel -> change "tap to show" to "always visible".