Is your feature request related to a problem? Please describe.
Especially the Battle icons are way too large and I didn't find an option in the configs (never written lua) out of the box to change the size

Describe the solution you'd like
An option to adjust the size for both Species and Battle icons

Describe alternatives you've considered
Can't think of an alternative

Additional context
These are the lines for Species which would need an option within the config window (thanks to Serpinecoh@curseforge)

function Pin:OnCreate()
  self.__super.OnCreate(self)
  self.icon:SetTexCoord(0.79687500, 0.49218750, 0.50390625, 0.65625000)
  self.icon:SetSize(10, 10)

  self:SetScript('OnClick', self.OnClick)
  self:SetSize(10, 10)
end

I would like to 2nd this idea. The battle trainers' pictures are so big they obscure some of the other things going on near them on the map. Reducing their size to match the size of daily quest icons or pet battle icons (or at least giving us the option to) would be a huge help. Currently if you turn off "Battles" to get rid of that big picture you can no longer see the pet battle dailies that are up. Thank you.

Save a copy before and after - as if you auto update the addon it will overwrite the changes.

Go to your wow folder and to /AddOns/PetTracker/Components/Maps/RivalPin.lua

Open in notepad (or better yet go and download Notepad++ and use that - much easier)
Open RivalPin.lua

Cntr-F to find Pin:OnCreate() and add in the lines: (before the End command)
self.icon:SetSize(20, 20)
self:SetSize(20, 20)

Go to the bottom of the function Pin:Display(rival) and (before the End command)
add the line:
self.Background:SetSize(20, 20)

or you can delete the map pins altogether.

Go to - (lines 112 to 114)
PetTracker\Features\MapCanvas.lua

see where it says
local pin = Addon.RivalPin()
pin:PlaceEncoded(frame, index, spot:match('(%w%w)(%w%w)'))
pin:Display(rival)

We want the addon to disregards the instructions so change it to:

--local pin = Addon.RivalPin()
--pin:PlaceEncoded(frame, index, spot:match('(%w%w)(%w%w)'))
--pin:Display(rival)

perhaps change it to readonly.