你的屏幕的分别率太低，而应用设计的分别率超出了你的屏幕的分别率，所以一部分控件显示到屏幕外去了。
从你提供的截图看，你的屏幕的分别率只有1366x768.
你试试把应用最大化，看看能不能出现滚动条。

Build Information:
wireshark 1.10.0 (SVN Rev Unknown from unknown)

Copyright 1998-2013 Gerald Combs <gerald@wireshark.org> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Compiled (64-bit) with GTK+ 2.24.18, with Cairo 1.12.14, with Pango 1.34.1,
with
GLib 2.36.3, with libpcap, with libz 1.2.7, with POSIX capabilities (Linux),
without libnl, with SMI 0.4.8, with c-ares 1.10.0, with Lua 5.1, without
Python,
with GnuTLS 3.1.11, with Gcrypt 1.5.2, with MIT Kerberos, with GeoIP, with
PortAudio V19-devel (built May 4 2013 13:59:07), with AirPcap.

Running on Linux 3.9.9-301.fc19.x86_64, with locale en_US.utf8, with libpcap
version 1.4.0, with libz 1.2.7, GnuTLS 3.1.11, Gcrypt 1.5.2, without AirPcap.
Genuine Intel(R) CPU U2300 @ 1.20GHz

Built using gcc 4.8.1 20130603 (Red Hat 4.8.1-1).

--
Steps to reproduce:

1: Use a 1366x768 or lower resolution display

2: Open wireshark gui

3: Click on "Capture Options" in first column

Observed results:

1: Bottom of window is cut off and unable to see or access those options with
mouse.

2: Window cannot be resized smaller than about 761x756 px width*height (not
including titlebar).

3: Workarounds involve using the keyboard and comparing with a screenshot, or
enabling desktop panning.

Expected results:

Capture Options window should be able to be resized even smaller and show
scrollbars and/or redesigned to accommodate lower resolution displays.

我的笔记本显卡最高配置就是1366＊768

要么期望wireshark自己修复这个界面溢出的bug，要么换更高分别率的屏幕。