Problem with large size of v-checkbox element in Vuetify

You can try wrapping v-checkbox and v-text-field in v-layout

   <v-layout>
      <v-flex xs5>
        <v-layout>
          <v-checkbox v-model="includeFiles" hide-details class="shrink mr-2"></v-checkbox>
          <v-text-field label="Include files"></v-text-field>
        </v-layout>
      </v-flex>
      <v-flex xs1>Test</v-flex>
    </v-layout>