Customize columns and layout
Column management is done in the Grid Columns Manager panel, opened from the header (column manager button).
What you can do
Reorder columns: Drag-and-drop list of columns (e.g. with a grip icon). Order is applied to the grid and saved. The grid reads saved column state from localStorage (e.g. fleekdash_posts_agrid_state_<postType>) so order (and visibility) persist.
Show/hide columns: Each column has a switch or eye button. Turning a column off hides it in the grid. State is saved with the same key as order.
Rename column headers: An edit (pencil) control next to the column name lets you type a new header name. On save, the grid header updates and the custom name can be stored in column config so it persists.
Reset to defaults
A Reset to defaults (or similar) action restores the default column set and order for that post type. Useful if the layout gets too customized or something goes wrong.
Context: Posts vs Dashboard
Column state is stored per context: e.g. "posts" for the main Posts list and "dashboard" for the dashboard pending grid. So you can have one layout for the full list and another for the dashboard widget.
Focus on the columns you care about, in the order you like, with names that match your workflow. And keep that layout across sessions.