Default Inventory Hotswap render type = OVERLAY

.polymc/minecraft/config/inventoryhotswap-client.toml

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+#PUSHED will push up the players survival gui(hearts, xp bar, hunger, armor, air) above the vertical selection slots.
+#If set to INVISIBLE, then the survival gui will not be rendered when keybind it pressed.
+#If set to OVERLAY, then the survival gui will not be moved and the vertical selection bar will render over it
+#Allowed Values: INVISIBLE, PUSHED, OVERLAY
+guiRenderType = "OVERLAY"
+#Set to true if you want the quick selection key presses to be inverted.
+invertQuickSelection = false
+