app/components/Layout/ThemeSwitcher.vue

<template>
  <v-switch
    v-model="theme.global.name.value"
    density="compact"
    :inline="true"
    false-value="light"
    false-icon="fas fa-sun"
    true-value="dark"
    true-icon="fas fa-moon"
  />
</template>

<script setup lang="ts">
import { useTheme } from 'vuetify'

const theme = useTheme()
</script>

<style scoped lang="scss">
.v-switch {
  min-width: 60px;
  max-width: 60px;
  min-height: 40px;
  max-height: 40px;
}
</style>