Pablo
If you created a design from scratch (just selecting the FPGA and not a board) there are no presets for the board as Vivado doesn't know what is connected.
If you start the design using the template of one of Xilinx's boards (ZCU102/ZCU04/etc...) you will probably see the preset option as Xilinx's already knows the speed and size of the DDR RAM as well as the available peripherals mounted on the board
The presets (as you can see in the pics) are for the Zynq IP core, not for the board itself. For the board itself, what you usually get from the vendor, are the "board definition files". Don't get confused about both concepts.
The problem I'm experiencing appears only in Vivado 2020.1, and not in the previous versions.