In mobile – we have Make a reservation button –

wprentals\templates\mobile_booking.php  line 51

in property page – template Type 2 https://prnt.sc/bigwRqEoawh4

templates\property_page_templates\listing_page_2.php  is template file for type 2

Sidebar with contact form is in function wpestate_show_booking_form -wprentals\libs\help_functions.php around line 1139