Hi,

Go to Dashboard -> STEC -> Fonts & Colors -> Custom style tab and add following css:

.stec-layout-boxgrid-event-tags,
.stec-layout-boxgrid-event-timespan {
    display: none !important;
}

By default you can navigate to past dates from the top menu. 

If you want the calendar to show certain month you can use start_date shortcode parameter. 

Example:

[stachethemes_ec views=boxgrid view=boxgrid start_date=2022-01-31]

the date must be in YYYY-MM-DD format like in the example.

Update the previous style to this:

.stec-layout-boxgrid-event-timespan-wrap,
.stec-layout-boxgrid-event-tags,
.stec-layout-boxgrid-event-timespan {
    display: none !important;
}