ctrlpanel/resources/views/admin/settings/tabs/system.blade.php

<div class="tab-pane mt-3" id="system">
    <form method="POST" enctype="multipart/form-data" class="mb-3"
        action="{{ route('admin.settings.update.systemsettings') }}">
        @csrf
        @method('PATCH')

        <div class="form-group">
            <div class="custom-control mb-3">
                <label for="phpmyadmin-url">{{ __('PHPMyAdmin URL') }}</label>
                <input x-model="phpmyadmin-url" id="phpmyadmin-url" name="phpmyadmin-url" type="text"
                    value="{{ config('SETTINGS::MISC:PHPMYADMIN:URL') }}"
                    class="form-control @error('phpmyadmin-url') is-invalid @enderror">
            </div>
        </div>

        <div class="col-md-6 col-lg-4 col-12">
            <div class="form-group">
                <div class="custom-file mb-3 mt-3">
                    <input type="file" accept="image/png,image/jpeg,image/jpg" class="custom-file-input" name="icon"
                        id="icon">
                    <label class="custom-file-label selected" for="icon">{{ __('Select panel icon') }}</label>
                </div>
                @error('icon')
                    <span class="text-danger">
                        {{ $message }}
                    </span>
                @enderror
            </div>
            <div class="form-group">
                <div class="custom-file mb-3">
                    <input type="file" accept="image/x-icon" class="custom-file-input" name="favicon" id="favicon">
                    <label class="custom-file-label selected" for="favicon">{{ __('Select panel favicon') }}</label>
                </div>
                @error('favicon')
                    <span class="text-danger">
                        {{ $message }}
                    </span>
                @enderror
            </div>
        </div>

        <button class="btn btn-primary">{{ __('Submit') }}</button>
    </form>
</div>