The tool bar has the following buttons:

Go to the previous or next location in the jump history. If there is no previous location in the jump history, then the corresponding button is disabled.

Enter or exit select mode. See the information about the Edit menu's Select Mode command for more information.

Enter the text you want to find and press Return. To search for the next occurrence of the text, press Return again. See the information about the Edit menu's Find command for more information. Press the icon to specify additional options.

Activate the bookmark list so that you can select a bookmark to which to jump. If the document has no bookmarks set, then this button is disabled.

Go to the top of the home page of the document. If a home page was not specified when the document was converted or if the document format does not support a home page specification, then this results in a jump to the top of the first page of the document.

Click the button on the left to jump to the beginning of the previous page.
If the document has only one page, then this button
is disabled. Before actually jumping, iSilo™
adds the current location to the
jump history.
Click the button on the right to Jump to the beginning of the next page.
If the document has only one page, then this button
is disabled. Before actually jumping, iSilo™
adds the current location to the
jump history.
The middle button serves two purposes. The first is
to show the current location in the document, expressed either as the
current location within the current page expressed as a percentage
value or as the current page number, depending on the
Location option setting.
The second purpose is for activating the Go To dialog.
See the information about the View menu's
Go To command
for more information about the Go To dialog.