How do deployment slot settings work on an Azure App Service?

Slot 4 Recessed Linear by Mark Architectural Lighting™ Emergency Lighting BLT Low-Profile Recessed LED by Lithonia Lighting® BLT Low-Profile Recessed LED

At the moment one RAM is in Slot 2 and one in slot 3 The message tells me to move the RAM from slot 3 to slot 4 But it looks odd if I do

markas338 slot A' level with grade not lower than D Mark Sheets of their A'S LEVEL Exam HSC

markastoto slot MPEG-4 4:2:2 10-Bit UHD 4K at 2550 Dual Slot: SDSDHCSDXC Video IO 1x Micro-HDMI (Unspecified