Chinese to English Tech/Engineering Other meaning of “three-view page” in this context

Hello everyone.
In the manual for the software of a digital tomograph (originally written in Chinese) that I am translating from English into Spanish, I have the expression “three-view page” in the following context:
“When the three-view page is visible, drag the control button of the contrast slider on 2D image control panel to adjust the contrast of the images in the three three-view image display windows simultaneously”

Since the English version contains many errors, I am not sure if the intended meaning of this “three-view page” is
(a) one page containing three windows
(b) one page containing three views of the same image
(c) one page containing a 3D image
(d) none of the above

I copy below the sentence both in Chinese and English, so that you help me out with this:

Image processing 图像处理
（1）Contrast adjustment对比度调节
 Adjust contrast by adjusting slider
用对比度调节滑块进行调节
a. When the three-view page is visible, drag the control button of the contrast slider on 2D image control panel to adjust the contrast of the images in the three three-view image display windows simultaneously 当三视图页面处于可见状态时，拖动二维图像处理控制面板上的对比度滚动条 ，可同时调节三个三视图显示窗口内图像的对比度

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Many thanks in advance,
Manuel