It’s easy to define a custom sidebar command. Here’s an example that shows items in org-agenda-files that are not done and either have a deadline on or before today, or are scheduled for today. The query ((and ...) uses org-ql to select items.
(defun my/org-sidebar ()
"Display my Org Sidebar."
(interactive)
(org-sidebar
:sidebars (make-org-sidebar
:name "My Sidebar"
:description "My sidebar items"
:items (org-ql (org-agenda-files)
(and (not (done))
(or (deadline auto)
(scheduled :on today)))
:action element-with-markers))))org-sidebar also integrates with org-super-agenda. This command is like the previous one, but it groups items with org-super-agenda into several groups.
(defun my/org-today-sidebar ()
"Show my Org Today Sidebar."
(interactive)
(org-sidebar
:sidebars (make-org-sidebar
:name "Today"
:description "Today items"
:items (org-ql (org-agenda-files)
(and (not (done))
(or (deadline auto)
(scheduled :to today)))
:action element-with-markers)
:super-groups '((:time-grid t)
(:name "Overdue" :scheduled past :deadline past)
(:name "Due today" :scheduled today :deadline today)
(:tag "bills")
(:priority "A")
(:name "Non-tasks"
:todo nil)))))This shows a sidebar like this:
