<div>
Did you try double-clicking the bar?<br />

</div>


<div>
Yes, double-click can collapse the window. &nbsp;I just wonder why<br />
the button has disappeared. &nbsp;Did I accidently erased some<br />
extensions?<br />
<br />

</div>


Yes, double-click can collapse the window.  I just wonder why
the button has disappeared.  Did I accidently erased some
extensions?



<div>
I don't know why they removed the button but I don't know of any way to get it back<br />

</div>


I don't know why they removed the button but I don't know of any way to get it back


<div>
<div class="content wysiwyg-content">
The button to turn an application window to a bar, it disappeared. &nbsp;I tried to reinstall MacOS8.0 but could not<br />
restore it. &nbsp;why?
</div>
</div>


The button to turn an application window to a bar, it disappeared.  I tried to reinstall MacOS8.0 but could not
restore it.  why?

minimizing button disappeared on OS8.0

Apple's early computers ran on a variety of operating systems, including a Pascal version and one based on CP/M, before releasing its ProDOS with the advent of its 16-bit computer. With the release of the Lisa, which had its own OS, Apple and computing entered the graphical age; it was followed by the Macintosh, which offered a series of "System" operating systems. Other Mac operating systems included PowerPC until Apple acquired NeXT and folded it into the Mac OS. Current operating systems for Apple devices are Mac OS-X and iOS.